An axillary crutch contains a first support unit including two parallel first support columns, an armpit pad, two first connecting segments, and a grip bar a second support unit including two parallel second support columns and an abutting pad, and the two parallel second support columns coupling with the two parallel first support columns a positioning unit including two first fixing portions, an operating member, and two second fixing portions. The two first connecting segments of the first support unit are coupled on two top ends of the two parallel second support columns, and the two first fixing portions are locked with the two second fixing portions, such that when the operating member is pulled, the two first fixing portions remove from the two second fixing portions so that the first support unit and the second support unit are retracted.
