A collision determination apparatus for a vehicle is disclosed. The collision determination apparatus includes: a chamber member that is arranged in a bumper and has therein a chamber space; a main sensor that senses pressure of the chamber space; a safing sensor that senses the pressure of the chamber space independently of the main sensor; and a vehicle speed sensor that senses a speed of the vehicle. The collision determination apparatus detects an occurrence of a collision between an object and a bumper and determines whether the collision necessitates activation of the protection apparatus based on sensing results of the main sensor, the safing sensor and the vehicle speed sensor.