diff --git a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/CheckpointProblem.tsx b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/CheckpointProblem.tsx
index 78cd19af..705cc8a7 100644
--- a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/CheckpointProblem.tsx
+++ b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/CheckpointProblem.tsx
@@ -1,8 +1,9 @@
 'use client';
 
-import { Box, Button, Flex, HStack, VStack } from '@chakra-ui/react';
+import { Box, Button, Flex, HStack, VStack, useDisclosure } from '@chakra-ui/react';
 import { useRef } from 'react';
 
+import { CustomModal } from '../../../../../../components/molecules/CustomModal';
 import { SyntaxHighlighter } from '../../../../../../components/organisms/SyntaxHighlighter';
 import type { TurtleGraphicsHandle } from '../../../../../../components/organisms/TurtleGraphics';
 import { TurtleGraphics } from '../../../../../../components/organisms/TurtleGraphics';
@@ -12,20 +13,22 @@ import { solveProblem } from '../../../../../lib/solveProblem';
 import { Variables } from './Variables';
 
 interface CheckpointProblemProps {
+  beforeCheckPointLine: number;
+  checkPointLines: number[];
+  currentCheckPointLine: number;
+  explanation?: Record<'title' | 'body', string>;
   problemProgram: string;
   selectedLanguageId: string;
-  checkPointLines: number[];
-  setStep: (step: ProblemType) => void;
-  beforeCheckPointLine: number;
   setBeforeCheckPointLine: (line: number) => void;
-  currentCheckPointLine: number;
   setCurrentCheckPointLine: (line: number) => void;
+  setStep: (step: ProblemType) => void;
 }
 
 export const CheckpointProblem: React.FC<CheckpointProblemProps> = ({
   beforeCheckPointLine,
   checkPointLines,
   currentCheckPointLine,
+  explanation,
   problemProgram,
   selectedLanguageId,
   setBeforeCheckPointLine,
@@ -34,6 +37,7 @@ export const CheckpointProblem: React.FC<CheckpointProblemProps> = ({
 }) => {
   const turtleGraphicsRef = useRef<TurtleGraphicsHandle>(null);
 
+  const { isOpen, onClose, onOpen } = useDisclosure();
   const beforeCheckpointResult = solveProblem(problemProgram).histories?.at(beforeCheckPointLine);
 
   const handleClickResetButton = (): void => {
@@ -90,7 +94,14 @@ export const CheckpointProblem: React.FC<CheckpointProblemProps> = ({
         </Box>
       </VStack>
       <VStack align="end" minW="50%" overflow="hidden">
-        <Button colorScheme="gray">解説</Button>
+        {explanation && (
+          <>
+            <Button colorScheme="gray" onClick={onOpen}>
+              解説
+            </Button>
+            <CustomModal body={explanation.body} isOpen={isOpen} title={explanation.title} onClose={onClose} />
+          </>
+        )}
         <Box h="640px" w="100%">
           <SyntaxHighlighter
             beforeCheckPointLine={beforeCheckPointLine}
diff --git a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/ExecutionResultProblem.tsx b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/ExecutionResultProblem.tsx
index 9ee57985..de2ac4f7 100644
--- a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/ExecutionResultProblem.tsx
+++ b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/ExecutionResultProblem.tsx
@@ -1,27 +1,31 @@
 'use client';
 
-import { Box, Button, Flex, HStack, VStack } from '@chakra-ui/react';
+import { Box, Button, Flex, HStack, VStack, useDisclosure } from '@chakra-ui/react';
 import { useRef } from 'react';
 
+import { CustomModal } from '../../../../../../components/molecules/CustomModal';
 import { SyntaxHighlighter } from '../../../../../../components/organisms/SyntaxHighlighter';
 import type { TurtleGraphicsHandle } from '../../../../../../components/organisms/TurtleGraphics';
 import { TurtleGraphics } from '../../../../../../components/organisms/TurtleGraphics';
 import type { ProblemType } from '../../../../../../types';
 
 interface ExecutionResultProblemProps {
+  explanation?: Record<'title' | 'body', string>;
+  handleComplete: () => void;
   problemProgram: string;
   selectedLanguageId: string;
   setStep: (step: ProblemType) => void;
-  handleComplete: () => void;
 }
 
 export const ExecutionResultProblem: React.FC<ExecutionResultProblemProps> = ({
+  explanation,
   handleComplete,
   problemProgram,
   selectedLanguageId,
   setStep,
 }) => {
   const turtleGraphicsRef = useRef<TurtleGraphicsHandle>(null);
+  const { isOpen, onClose, onOpen } = useDisclosure();
 
   const handleClickResetButton = (): void => {
     turtleGraphicsRef.current?.init();
@@ -49,7 +53,14 @@ export const ExecutionResultProblem: React.FC<ExecutionResultProblemProps> = ({
         </Box>
       </VStack>
       <VStack align="end" minW="50%" overflow="hidden">
-        <Button colorScheme="gray">解説</Button>
+        {explanation && (
+          <>
+            <Button colorScheme="gray" onClick={onOpen}>
+              解説
+            </Button>
+            <CustomModal body={explanation.body} isOpen={isOpen} title={explanation.title} onClose={onClose} />
+          </>
+        )}
         {/* 画面に収まる高さに設定 */}
         <Box h="calc(100vh - 370px)" w="100%">
           <SyntaxHighlighter code={problemProgram} programmingLanguageId={selectedLanguageId} />
diff --git a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/StepProblem.tsx b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/StepProblem.tsx
index 90d068bd..2a56e370 100644
--- a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/StepProblem.tsx
+++ b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/StepProblem.tsx
@@ -1,8 +1,9 @@
 'use client';
 
-import { Box, Button, Flex, HStack, VStack } from '@chakra-ui/react';
+import { Box, Button, Flex, HStack, VStack, useDisclosure } from '@chakra-ui/react';
 import { useRef } from 'react';
 
+import { CustomModal } from '../../../../../../components/molecules/CustomModal';
 import { SyntaxHighlighter } from '../../../../../../components/organisms/SyntaxHighlighter';
 import type { TurtleGraphicsHandle } from '../../../../../../components/organisms/TurtleGraphics';
 import { TurtleGraphics } from '../../../../../../components/organisms/TurtleGraphics';
@@ -13,16 +14,18 @@ import { Variables } from './Variables';
 interface StepProblemProps {
   beforeCheckPointLine: number;
   currentCheckPointLine: number;
+  explanation?: Record<'title' | 'body', string>;
+  handleComplete: () => void;
   problemProgram: string;
   selectedLanguageId: string;
   setBeforeCheckPointLine: (line: number) => void;
   setCurrentCheckPointLine: (line: number) => void;
-  handleComplete: () => void;
 }
 
 export const StepProblem: React.FC<StepProblemProps> = ({
   beforeCheckPointLine,
   currentCheckPointLine,
+  explanation,
   handleComplete,
   problemProgram,
   selectedLanguageId,
@@ -30,6 +33,7 @@ export const StepProblem: React.FC<StepProblemProps> = ({
   setCurrentCheckPointLine,
 }) => {
   const turtleGraphicsRef = useRef<TurtleGraphicsHandle>(null);
+  const { isOpen, onClose, onOpen } = useDisclosure();
 
   const beforeCheckpointResult = solveProblem(problemProgram).histories?.at(beforeCheckPointLine);
 
@@ -83,7 +87,14 @@ export const StepProblem: React.FC<StepProblemProps> = ({
         </Box>
       </VStack>
       <VStack align="end" minW="50%" overflow="hidden">
-        <Button colorScheme="gray">解説</Button>
+        {explanation && (
+          <>
+            <Button colorScheme="gray" onClick={onOpen}>
+              解説
+            </Button>
+            <CustomModal body={explanation.body} isOpen={isOpen} title={explanation.title} onClose={onClose} />
+          </>
+        )}
         <Box h="640px" w="100%">
           <SyntaxHighlighter
             beforeCheckPointLine={beforeCheckPointLine}
diff --git a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/page.tsx b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/page.tsx
index bb9dd519..2b3025bd 100644
--- a/src/app/(withAuth)/courses/[courseId]/programs/[programId]/page.tsx
+++ b/src/app/(withAuth)/courses/[courseId]/programs/[programId]/page.tsx
@@ -5,7 +5,7 @@ import type { NextPage } from 'next';
 import { useEffect, useState } from 'react';
 import { useSessionContext } from 'supertokens-auth-react/recipe/session';
 
-import { generateProgram, programIdToName } from '../../../../../../problems/problemData';
+import { generateProgram, getExplanation, programIdToName } from '../../../../../../problems/problemData';
 import type { ProblemType } from '../../../../../../types';
 import { getLanguageIdFromSessionStorage } from '../../../../../lib/SessionStorage';
 import { createUserSolvedProblem } from '../../../../../lib/actions';
@@ -42,11 +42,14 @@ const ProblemPage: NextPage<{ params: { courseId: string; programId: string } }>
     }
   };
 
+  const explanation = getExplanation(programId, selectedLanguageId);
+
   const ProblemComponent: React.FC = () => {
     switch (step) {
       case 'normal': {
         return (
           <ExecutionResultProblem
+            explanation={explanation}
             handleComplete={handleSolveProblem}
             problemProgram={problemProgram}
             selectedLanguageId={selectedLanguageId}
@@ -60,6 +63,7 @@ const ProblemPage: NextPage<{ params: { courseId: string; programId: string } }>
             beforeCheckPointLine={beforeCheckPointLine}
             checkPointLines={checkPointLines}
             currentCheckPointLine={currentCheckPointLine}
+            explanation={explanation}
             problemProgram={problemProgram}
             selectedLanguageId={selectedLanguageId}
             setBeforeCheckPointLine={setBeforeCheckPointLine}
@@ -73,6 +77,7 @@ const ProblemPage: NextPage<{ params: { courseId: string; programId: string } }>
           <StepProblem
             beforeCheckPointLine={beforeCheckPointLine}
             currentCheckPointLine={currentCheckPointLine}
+            explanation={explanation}
             handleComplete={handleSolveProblem}
             problemProgram={problemProgram}
             selectedLanguageId={selectedLanguageId}
diff --git a/src/components/molecules/CustomModal.tsx b/src/components/molecules/CustomModal.tsx
new file mode 100644
index 00000000..cafde7d2
--- /dev/null
+++ b/src/components/molecules/CustomModal.tsx
@@ -0,0 +1,37 @@
+import {
+  Button,
+  ModalBody,
+  Modal,
+  ModalCloseButton,
+  ModalContent,
+  ModalFooter,
+  ModalHeader,
+  ModalOverlay,
+} from '@chakra-ui/react';
+
+interface CustomModalProps {
+  title: string;
+  body: string;
+  isOpen: boolean;
+  onClose: () => void;
+}
+
+export const CustomModal: React.FC<CustomModalProps> = ({ body, isOpen, onClose, title }) => {
+  return (
+    <>
+      <Modal isOpen={isOpen} onClose={onClose}>
+        <ModalOverlay />
+        <ModalContent>
+          <ModalHeader>{title}</ModalHeader>
+          <ModalCloseButton />
+          <ModalBody>{body}</ModalBody>
+          <ModalFooter>
+            <Button colorScheme="blue" onClick={onClose}>
+              閉じる
+            </Button>
+          </ModalFooter>
+        </ModalContent>
+      </Modal>
+    </>
+  );
+};
diff --git a/src/problems/problemData.ts b/src/problems/problemData.ts
index a131a84a..078bc550 100644
--- a/src/problems/problemData.ts
+++ b/src/problems/problemData.ts
@@ -53,8 +53,8 @@ turtle.moveForward();` || programIdToLanguageIdToProgram[programId][languageId]
   );
 }
 
-export function getExplanation(programId: ProgramId, languageId: LanguageId): string {
-  return programIdToLanguageIdToExplanation[programId][languageId];
+export function getExplanation(programId: ProgramId, languageId: LanguageId): Record<'title' | 'body', string> {
+  return programIdToLanguageIdToExplanation[programId]?.[languageId];
 }
 
 export const programIdToLanguageIdToProgram: Record<ProgramId, Record<LanguageId, string>> = {
@@ -92,21 +92,40 @@ public class Curve {
   },
 };
 
-export const programIdToLanguageIdToExplanation: Record<ProgramId, Record<LanguageId, string>> = {
+export const programIdToLanguageIdToExplanation: Record<
+  ProgramId,
+  Record<LanguageId, Record<'title' | 'body', string>>
+> = {
   straight: {
-    js: `
-JavaScript向けの解説。JavaScript向けの解説。
+    js: {
+      title: 'JavaScript向けstraightの解説のタイトル',
+      body: `
+JavaScript向けstraightの解説
+解説文がここに入ります。
 `.trim(),
-    java: `
-Java向けの解説。Java向けの解説。
+    },
+    java: {
+      title: 'Java向けstraightの解説のタイトル',
+      body: `
+Java向けstraightの解説
+解説文がここに入ります。
 `.trim(),
+    },
   },
   curve: {
-    js: `
-JavaScript向けの解説。JavaScript向けの解説。
+    js: {
+      title: 'JavaScript向けcurveの解説のタイトル',
+      body: `
+JavaScript向けcurveの解説
+解説文がここに入ります。
 `.trim(),
-    java: `
-Java向けの解説。Java向けの解説。
+    },
+    java: {
+      title: 'Java向けcurveの解説のタイトル',
+      body: `
+Java向けcurveの解説
+解説文がここに入ります。
 `.trim(),
+    },
   },
 };