Provided is an automobile headrest which can be prevented from being drawn out inadvertently or on purpose, and can be drawn out through a special operation if necessary. The automobile headrest includes a falloff preventing mechanism that can be composed of the same components as those of a height adjusting mechanism to be used. In the automobile headrest, a headrest stay is inserted in a headrest bush provided with a height adjusting mechanism. The headrest stay is provided with a height adjusting notch and a falloff preventing notch. The height adjusting mechanism can also serve as one headrest falloff preventing mechanism, so the height adjusting mechanism can lock and unlock the headrest. Another headrest stay is provided with a falloff preventing notch. Another headrest bush in which the other headrest stay is inserted is provided with the headrest falloff preventing mechanism including a lock member. The lock member is provided to abut on the other headrest stay inserted in the other headrest bush due to a resilient force of a spring so as to be capable of reciprocating. The lock member engages with the falloff preventing notch of the other headrest stay to prevent the headrest from falling off, and disengages from the falloff preventing notch when the lock member is operated against the resilient force of the spring. The falloff preventing notches arranged in both headrest stays are provided at different height positions.
