diff --git a/kadai1/uetsu/imgConv/convert/convert.go b/kadai1/uetsu/imgConv/convert/convert.go
new file mode 100644
index 0000000..d693a76
--- /dev/null
+++ b/kadai1/uetsu/imgConv/convert/convert.go
@@ -0,0 +1,50 @@
+package convert
+
+import (
+	"image"
+	"image/jpeg"
+	"image/png"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// InputExt 拡張子の変換前と変換後を格納する。
+type InputExt struct {
+	Src string
+	Dst string
+}
+
+// ImgConv ファイルをjpgからpngに変換する。
+// TODO: 他の拡張子に対応
+func ImgConv(filePath string, inputExt InputExt) (convertedFilePath string, err error) {
+	file, err := os.Open(filePath)
+	if err != nil {
+		return
+	}
+	defer file.Close()
+
+	var decodeImage image.Image
+	switch inputExt.Src {
+	case "jpg", "jpeg":
+		decodeImage, err = jpeg.Decode(file)
+	}
+	if err != nil {
+		return
+	}
+
+	convertedFilePath = strings.Join([]string{filePath[:len(filePath)-len(filepath.Ext(filePath))], inputExt.Dst}, ".")
+
+	dstfile, err := os.Create(convertedFilePath)
+	if err != nil {
+		return
+	}
+	defer dstfile.Close()
+
+	err = png.Encode(dstfile, decodeImage)
+	if err != nil {
+		return
+	}
+
+	return
+}
diff --git a/kadai1/uetsu/imgConv/doc.go b/kadai1/uetsu/imgConv/doc.go
new file mode 100644
index 0000000..89ce20b
--- /dev/null
+++ b/kadai1/uetsu/imgConv/doc.go
@@ -0,0 +1,19 @@
+// Copyright 2019 masashi.uetsu. All rights reserved.
+
+/*
+	指定したディレクトリ配下のjpegファイルを再帰的に探索してpngファイルに変換します。ディレクトリは並べて複数指定可能です。
+
+	Usage
+
+		imgconv dirPath dirPath
+
+	func searchfile.RecursionFile
+
+		RecursionFile(dirPath string) (filePathList []string)
+
+	func convert.ImgConv
+
+		ImgConv(filePath string) (convertedFilePath string, err error)
+
+*/
+package main
diff --git a/kadai1/uetsu/imgConv/main.go b/kadai1/uetsu/imgConv/main.go
new file mode 100644
index 0000000..7f4c3b0
--- /dev/null
+++ b/kadai1/uetsu/imgConv/main.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"dojo6/kadai1/uetsu/ImgConv/convert"
+	"dojo6/kadai1/uetsu/imgConv/searchfile"
+)
+
+func main() {
+	flag.Parse()
+	args := flag.Args()
+
+	inputExt := convert.InputExt{
+		"jpg",
+		"png",
+	}
+
+	for _, dirPath := range args {
+		filePathList := searchfile.RecursionFile(dirPath)
+
+		for _, filePath := range filePathList {
+			convertedFilePath, err := convert.ImgConv(filePath, inputExt)
+			if err != nil {
+				fmt.Printf("%s convert fail\n", filePath)
+				continue
+			}
+			fmt.Printf("%s convert succeed => %s\n", filePath, convertedFilePath)
+		}
+
+	}
+}
diff --git a/kadai1/uetsu/imgConv/searchfile/searchfile.go b/kadai1/uetsu/imgConv/searchfile/searchfile.go
new file mode 100644
index 0000000..f7ea913
--- /dev/null
+++ b/kadai1/uetsu/imgConv/searchfile/searchfile.go
@@ -0,0 +1,28 @@
+package searchfile
+
+import (
+	"io/ioutil"
+	"path/filepath"
+)
+
+// RecursionFile 再帰的にファイル名の一覧を取得する
+func RecursionFile(dirPath string) (filePathList []string) {
+
+	files, err := ioutil.ReadDir(dirPath)
+	if err != nil {
+		panic(err)
+	}
+
+	for _, file := range files {
+		if file.IsDir() {
+			filePathList = append(filePathList, RecursionFile(filepath.Join(dirPath, file.Name()))...)
+			continue
+		}
+		if filepath.Ext(file.Name()) != ".jpg" {
+			continue
+		}
+		filePathList = append(filePathList, filepath.Join(dirPath, file.Name()))
+	}
+
+	return
+}
diff --git a/kadai1/uetsu/imgConv/searchfile/searchfile_test.go b/kadai1/uetsu/imgConv/searchfile/searchfile_test.go
new file mode 100644
index 0000000..82cd8ce
--- /dev/null
+++ b/kadai1/uetsu/imgConv/searchfile/searchfile_test.go
@@ -0,0 +1,44 @@
+package searchfile_test
+
+import (
+	"dojo6/kadai1/uetsu/ImgConv/searchfile"
+	"sort"
+	"testing"
+)
+
+var TestCase = []struct {
+	in  string
+	out []string
+}{
+	{"sample", []string{"sample/hoge.jpg"}},
+	{"sample2", []string{"sample2/hoge.jpg", "sample2/hogo/hoge2.jpg"}},
+}
+
+func Test_RecursionFile(t *testing.T) {
+	for _, tt := range TestCase {
+		expect := tt.out
+		actual := searchfile.RecursionFile(tt.in)
+		sort.Strings(expect)
+		sort.Strings(actual)
+		if len(actual) != len(expect) {
+			t.Errorf(`expect="%s" actual="%s"`, expect, actual)
+			break
+		}
+		for i := range expect {
+			if actual[i] != expect[i] {
+				t.Errorf(`expect="%s" actual="%s"`, expect, actual)
+				break
+			}
+		}
+	}
+}
+func Test_FileNotExists(t *testing.T) {
+	t.Helper()
+	defer func() {
+		err := recover()
+		if err == nil {
+			t.Errorf("Unexpected File Exists")
+		}
+	}()
+	searchfile.RecursionFile("test")
+}