A small watercraft equipped with a lock mechanism for an engine hood is disclosed. The watercraft includes a deck, an engine hood that is pivotably provided to the deck around a pivot shaft, and covers an engine room thereunder from above so as to open and close, and a lock mechanism for locking the hood in an open position. The mechanism includes one member attached to the hood, another member attached to the deck, and a stopping member. At least one of the one member and the another member is formed with a protruding portion that protrudes in the radial direction of the pivoting. The stopping member is attached to the other member, and the protruding portion engages with the stopping member when the engine hood reaches a predetermined open position so that the protruding portion stops the pivoting of the one member to lock the hood in the position.