The present invention is provided with: a driving-side scroll member (7), a driven-side scroll member; a driving-side support member that is fixed to the tip side in the rotational axis direction of adriving-side wall body (7b) and that rotates together with the driving-side scroll member (7); and a driven-side support member that is fixed to the tip side in the rotational axis direction of a driven-side wall body and that rotates together with the driven side-scroll member. A driving-side fixing part (7f) of the driving-side wall body (7b), to which the driving-side support member is fixed,is provided in the vicinity of a radially outer end portion (7e) of the driving-side wall body (7b) and positioned spaced apart from the radially outer end portion (7e) in the inner circumferential direction of the driving-side wall body (7b), and a driven-side fixing part of the driven-side wall body, to which the driven-side support member is fixed, is provided in the vicinity of a radially outer end portion of the driven-side wall body and positioned spaced apart from the radially outer end portion in the inner circumferential direction of the driven-side wall body.