A casing (43) of an in-wheel motor drive device (10) includes a tubular body first casing (43g) disposed on one side in an axial (O) direction and a tubular body second casing (43a) disposed on the other side in the axial direction. Each of the body first casing and the body second casing has an annular abutting surface (43j) so that the annular abutting surfaces of the body first casing and the body second casing abut on each other in the axial direction. A hub carrier (18) has at its tip end a connecting portion (82s) for rotatable connection to a vehicle body-side member (81). The connecting portion is disposed so as not to overlap the abutting surfaces in the axial direction and so as to overlap the body first casing or the body second casing in the axial direction.