STICKING DIAGNOSIS APPARATUS AND STICKING DIAGNOSIS METHOD

A sticking diagnosis apparatus for diagnosing a presence of sticking at a positive-electrode relay and at a negative-electrode relay, the sticking diagnosis apparatus including: an obtaining section that obtains, a first voltage value that is a voltage between a point downstream of the positive-electrode relay and a point upstream of the negative-electrode relay and a second voltage value that is a voltage of a diagnosis circuit provided in parallel to the negative-electrode relay; a determination section that when the first voltage value is greater than or equal to a first threshold, determines that the positive-electrode relay is in a state in which the positive-electrode relay remains in the closed state, and when the second voltage value is less than or equal to a second threshold, determines that the negative-electrode relay is in a state in which the negative-electrode relay remains in the closed state.