To provide a cantilever support structure of a bar-like member capable of facilitating mounting and dismounting and supporting the bar-like member on a wall body securely and having large withstand load.

An engaging member 30 provided with a knock pin 32 energized so as to come in and out at a tip and a hooking pin 35 at a proper position is attached to an end part of a hanger rod 11. A support bracket 20 is buried into the wall body 12, a support transparent hole 21 allowing the insertion of the engaging member 30 and a positioning hole 22 allowing the insertion of the hooking pin are formed on a front wall 20a, a positioning projecting part 23 is formed on a rear surface, and a knock hole 24 in which a knock pin 13 is inserted is formed on a rear surface wall 20b. When making the hooking pin 35 match with the positioning hole 22, inserting the engaging member 30 into the support transparent hole 21, and pushing it therein, the knock pin 32 is buried. When the hooking pin 35 passes the front wall 20b and the engaging member 30 is turned substantially 90 degrees, the hooking pin 35 is engaged with the positioning projecting part 23 to support the hanger rod 11 on the wall body 12.