To provide an ironing board provided with a simple locking device having a structure capable of automatically locking at the time when a support leg is erected and easily releasing the lock at the time of folding the support leg.

This ironing board has a hollow horizontal axis part 2a at the upper end of a support leg 2 fitted to a bearing 3 on the rear side of the ironing board main body 1 rotatably, and the rear side of the ironing board main body 1 is provided with a locking device 4 of the support leg comprising a guide pin 41 penetrated through and fixed to the hollow horizontal axis part 2a in a diameter direction with the one end part of the pin 41a projecting, a lock pin 42 installed to the hollow horizontal axis part 2a to oscillate with the one end part of the pin 42a projecting, an extension spring 43 stretched between both of the pins 41 and 42, a guide pin-guiding groove 44 and lock pin-guiding groove 45 that are formed in the bearing 3 circumferentially and a lock groove 46 bent to the guide pin-guiding groove from the end part of the lock pin-guiding groove and formed.