the up down direction a left portion of the support portion 133 protrudes further to the rear than a right portion of the support portion 133 a cylindrical pin 135 is provided on the rear end portion of the left portion of the support portion 133 the pin 135 protrudes upward from the support portion 133 a central line of the pin 135 is denoted by p a direction in which the pin 135 extends is parallel to the needle bar 110 the outer diameter of the pin 135 is generally the same as the size of a groove width of a long groove 191 that is provided in the guide member 190 which will be described below the needle bar base 130 includes a bent portion 136 the bent portion 136 is a portion that extends to the rear from a portion of the needle bar base 130 above the center of the needle bar base 130 in the up down direction such that the bent portion 136 is parallel to the support portion 133 a hole not shown in the drawings having a same inner diameter as a diameter of the hole 134 is formed in the bent portion 136 as shown in fig3 the needle bar 110 is inserted into and supported by the hole 134 and the hole of the bent portion 136 such that the needle bar 110 may be moved in the up down direction an attachment portion 111 is provided on the lower end portion of the needle bar 110 the sewing needle 101 may be attached to and removed from the.