if the presser foot 2 rolls between a position 2 39 indicated by continuous lines and a position 2 34 indicated by alternate long and short dash lines in fig8 the inner side surfaces of the knuckles 2d and 2e of the presser foot 2 slides along the curved protrusions 1h and 1i without being obstructed by the knuckle 1e of the presser foot holding member 1 since the end portion of the support member 10 is loosely fitted in the through hole 1j of the presser foot holding member 1 the end portion of the support member 10 moves up and down as the presser foot 2 rolls relative to the knuckle 1e of the presser foot holding member 1 when the presser foot 2 is turned upward about the axis of the presser foot support pin 4 to raise the front portion thereof the longer arm 3c of the pressing spring 3 is bent elastically upward and the loop 3e of the longer arm 3c of the pressing spring 3 pressed elastically against the lower surface of the second opening 1c of the presser foot holding member 1 is pressed against the upper surface of the second opening 1c the engagement of the loop 3e and the upper surface of the second opening 1c limits the upward bending of the longer arm 3c and the friction between the loop 3e and the upper surface of the second opening 1c restrains the longer arm 3c from transverse movement thus the engagement of the loop 3e and the upper surface of the second opening 1c prevents the longer arm 3c of the pressing spring 3 from slipping off the presser foot holding member 1 more effectively than the engagement of the longer arm 3c and.