diff --git a/README.md b/README.md
index e5b546c6f..68d17b872 100644
--- a/README.md
+++ b/README.md
@@ -591,6 +591,13 @@ dsn: mongodb://mongoadmin:secret@localhost:27017/test
 dsn: mongodb://mongoadmin:secret@localhost:27017/test?sampleSize=20
 ```
 
+If a field has multiple types, the `multipleFieldType` query can be used to list all the types.
+
+``` yaml
+# .tbls.yml
+dsn: mongodb://mongoadmin:secret@localhost:27017/test?sampleSize=20&multipleFieldType=true
+```
+
 **JSON:**
 
 The JSON file output by the `tbls out -t json` command can be read as a datasource.
diff --git a/datasource/mongo.go b/datasource/mongo.go
index 716ce7333..1df1af719 100644
--- a/datasource/mongo.go
+++ b/datasource/mongo.go
@@ -14,7 +14,10 @@ import (
 	"go.mongodb.org/mongo-driver/mongo/readpref"
 )
 
-const defaultSampleSize = 1000
+const (
+	defaultSampleSize        = 1000
+	defaultMultipleFieldType = false
+)
 
 // AnalyzeMongodb analyze `mongodb://`
 func AnalyzeMongodb(urlstr string) (*schema.Schema, error) {
@@ -50,7 +53,11 @@ func AnalyzeMongodb(urlstr string) (*schema.Schema, error) {
 	if err != nil {
 		sampleSize = defaultSampleSize
 	}
-	driver, err := mongodb.New(ctx, client, dbName, sampleSize)
+	multipleFieldType, err := strconv.ParseBool(values.Get("multipleFieldType"))
+	if err != nil {
+		multipleFieldType = defaultMultipleFieldType
+	}
+	driver, err := mongodb.New(ctx, client, dbName, sampleSize, multipleFieldType)
 	if err != nil {
 		return s, err
 	}
diff --git a/drivers/mongodb/mongodb.go b/drivers/mongodb/mongodb.go
index cfededa33..d822004dd 100644
--- a/drivers/mongodb/mongodb.go
+++ b/drivers/mongodb/mongodb.go
@@ -4,7 +4,9 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"slices"
 	"sort"
+	"strings"
 
 	"github.com/k1LoW/tbls/dict"
 	"github.com/k1LoW/tbls/schema"
@@ -14,19 +16,23 @@ import (
 	"go.mongodb.org/mongo-driver/mongo"
 )
 
+const columnTypeSeparator = ","
+
 type Mongodb struct {
-	ctx        context.Context
-	client     *mongo.Client
-	dbName     string
-	sampleSize int64
+	ctx               context.Context
+	client            *mongo.Client
+	dbName            string
+	sampleSize        int64
+	multipleFieldType bool
 }
 
-func New(ctx context.Context, client *mongo.Client, dbName string, sampleSize int64) (*Mongodb, error) {
+func New(ctx context.Context, client *mongo.Client, dbName string, sampleSize int64, multipleFieldType bool) (*Mongodb, error) {
 	return &Mongodb{
-		ctx:        ctx,
-		client:     client,
-		dbName:     dbName,
-		sampleSize: sampleSize,
+		ctx:               ctx,
+		client:            client,
+		dbName:            dbName,
+		sampleSize:        sampleSize,
+		multipleFieldType: multipleFieldType,
 	}, nil
 }
 
@@ -120,6 +126,10 @@ func (d *Mongodb) listFields(collection *mongo.Collection) ([]*schema.Column, er
 			if !columnInColumns(column, columns) {
 				columns = append(columns, column)
 			}
+
+			if d.multipleFieldType {
+				columns = addColumnType(columns, key, valueType)
+			}
 		}
 	}
 	for _, col := range columns {
@@ -145,6 +155,25 @@ func columnInColumns(a *schema.Column, list []*schema.Column) bool {
 	return false
 }
 
+// addColumnType adds a new type to the specified column
+func addColumnType(list []*schema.Column, columnName, valueType string) []*schema.Column {
+	columns := make([]*schema.Column, len(list))
+
+	for i, col := range list {
+		column := *col
+		if column.Name == columnName {
+			types := append(strings.Split(column.Type, columnTypeSeparator), valueType)
+			slices.Sort(types)
+			uniqTypes := slices.Compact(types)
+			column.Type = strings.Join(uniqTypes, columnTypeSeparator)
+		}
+
+		columns[i] = &column
+	}
+
+	return columns
+}
+
 func (d *Mongodb) listIndexes(collection *mongo.Collection) ([]*schema.Index, error) {
 	indexes := []*schema.Index{}
 	indexSpec, err := collection.Indexes().ListSpecifications(d.ctx)
diff --git a/drivers/mongodb/mongodb_test.go b/drivers/mongodb/mongodb_test.go
index d1acfd5d0..8b00716a3 100644
--- a/drivers/mongodb/mongodb_test.go
+++ b/drivers/mongodb/mongodb_test.go
@@ -5,6 +5,7 @@ package mongodb
 import (
 	"context"
 	"net/url"
+	"reflect"
 	"strings"
 	"testing"
 
@@ -38,7 +39,7 @@ func TestAnalyze(t *testing.T) {
 	s := &schema.Schema{
 		Name: "MongoDB local `docker-mongo-sample-datasets`",
 	}
-	driver, err := New(ctx, client, dbName, 10)
+	driver, err := New(ctx, client, dbName, 10, false)
 	if err != nil {
 		t.Errorf("%v", err)
 	}
@@ -55,3 +56,57 @@ func TestAnalyze(t *testing.T) {
 		t.Errorf("got not empty string.")
 	}
 }
+
+func Test_addColumnType(t *testing.T) {
+	columns := []*schema.Column{
+		{
+			Name: "username",
+			Type: "string",
+		},
+		{
+			Name: "age",
+			Type: "int",
+		},
+	}
+
+	tests := []struct {
+		name       string
+		list       []*schema.Column
+		columnName string
+		valueType  string
+		want       []*schema.Column
+	}{
+		{
+			name:       "Existing types are not added",
+			list:       columns,
+			columnName: "username",
+			valueType:  "string",
+			want:       columns,
+		},
+		{
+			name:       "New types are added with comma separation",
+			list:       columns,
+			columnName: "age",
+			valueType:  "string",
+			want: []*schema.Column{
+				{
+					Name: "username",
+					Type: "string",
+				},
+				{
+					Name: "age",
+					Type: "int,string",
+				},
+			},
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			got := addColumnType(test.list, test.columnName, test.valueType)
+			if !reflect.DeepEqual(got, test.want) {
+				t.Errorf("got %v\nwant %v", got, test.want)
+			}
+		})
+	}
+}