To provide a relatively compact end part support device of a usable support member with obtainable rigidity effective even in simplifying repairing work, capable of easily coping even with a change in the thickness of concrete such as a slab embedded with this device, by easily removing these projecting members from the concrete after finishing an original role as the end part support device of the support member.

This end part support device uses a vertical member 1 having a male screw part 8 substantially vertically erected to a horizontal form 5 and an inclined member 2 having a female screw part 7 threadedly engageable with the male screw part 8 in one end part and having the other end part fixed to the horizontal form 5; and is provided with an end part support part 11 connectable to an end part of the support member via an extractable support member 12 detachably constituted to the male screw part 8 of the vertical member 1.