A pop-up hood apparatus includes a hood, a hood lock mechanism, a support mechanism, an actuator, and a pair of auxiliary support parts. The support mechanism has a movable block and a base block. Each auxiliary support part includes: a load reception block that is capable of supporting the side edge part of the hood from below; a biasing member that biases the load reception block upward; and a displacement regulation member that regulates an upward displacement from an initial position of the load reception block against a biasing force of the biasing member. The movable block and the displacement regulation member are interlocked by an interlock part that displaces the displacement regulation member in a regulation release direction in response to an upward displacement of the movable block by the actuator.