To provide a needle swinging device for the sewing machine with which the exchange of needle swing cam is facilitated and various needle swing patterns can be easily formed without exchanging any needle swinging cam.

Plural needle swinging cams 11 (11a and 11b) respectively forming cam grooves 10 (10a and 10b) variously formed so as to form the various needle swing patterns with a cam driving shaft 9 are arranged so as to be respectively independently attached/detached, a cam body 23 is mounted on a needle swing driving shaft 18 so as to be moved axially to the needle swing driving shaft 18 by a moving mechanism 29 and on this cam body 23, a cam arm 16 is arranged so as to be respectively selectively engaged with the cam grooves 10 by axially moving the cam body 23.