To provide a leg with vertical height adjusting function capable of easily fine-adjusting a height and also easily and largely changing the height.

In this leg 100 with the vertical height function, a lock member 130 in which a female screw meshed with a male screw 114 is formed and an energizing member 140 energizing the lock member 130 in the direction of a cylindrical part 111 are stored in a casing 120 through which a leg member 110 formed by forming a male screw 114 on the outer peripheral surface of the cylindrical part 111 is passed. With the lock member 130 brought into contact with the cylindrical part 111, the height can be adjusted by the action of the screws 114 and 133. When the contact of the lock member 130 with the cylindrical part 111 is released by pushing a lock member body 131 projected to the outside of the casing 120, the height can be adjusted without relying upon the action of the screws 114 and 133.