To provide a new joist support which can greatly reduce the period of construction work.

A joist support for construction comprises a drive-nail pointed head 2 formed by curving and raising one end of a plate at right angles and support legs 5, 6, 7 formed by curving and raising the other end of the plate at right angles. The nail pointed head 2 is driven into a joist 20, and the support legs 5, 6, 7 are bonded to a building frame 24 using an adhesive 25 to support the joist 20. The nail pointed head 2 can be formed by cutting, curving and raising one end. The support legs 5, 6, 7 can be formed by splitting the other end into plural portions, and curving and raising them to the front and the back.