left arm portion 98 the mounting portion 90 is a plate member having a rectangular shape in a plan view and is longer in the left right direction the right arm portion 97 extends in the front rear direction and a rear end portion of the right arm portion 97 is fixed to the right end of the mounting portion 90 the left arm portion 98 extends in the front rear direction the rear end portion of the left arm portion 98 is fixed to a left portion of the mounting portion 90 such that the position in the left right direction with respect to the mounting portion 90 can be adjusted the right arm portion 97 may be engaged with one of the coupling portions 89 and the left arm portion 98 may be engaged with the other of the coupling portions 89 the x carriage 22 is a plate member and is longer in the left right direction a part of the x carriage 22 projects forward from the front face of the y carriage 23 the mounting portion 90 of the holder 24 may be attached to the x carriage 22 the x axis drive mechanism not shown in the drawings includes a linear movement mechanism not shown in the drawings the linear movement mechanism includes a timing pulley not shown in the drawings and a timing belt not shown in the drawings and the linear movement mechanism may cause the x carriage 22 to move in the left right direction the x axis direction using the x axis motor 132 as a drive source the y carriage 23 is a box shaped member.