In a stepping motor (1), three remaining protrusions can be spot-welded even if one of four protrusions is located in a position in which it can not be welded to the motor attachment plate (6) since four spot welding protrusions for protruding toward the output are formed in the outer stator core (41) of the stator group (4B). No problem exists for assembling even if four protrusions (452) are located in the outer stator core (41) of the stator group (4B) since all of four protrusions are spot-welded to a bearing holder (8) and the outer stator core (41) of the stator group (4A). The stator groups (4A, 4B) comprise the identically structured component. Provided is a stepping motor for enabling spot welding in at least three positions without a design change in an outer stator core even ifan attachment angle between a motor attachment plate and a stator is changed, and enabling an identically structured component to be used for the outer stator core in an output stator group and an opposite output stator group.