A charged particle track detector includes a radiator including a medium that generates Cherenkov light by interacting with incident charged particles, a light detection unit in which a plurality of two-dimensionally arrayed pixels are disposed to correspond to a predetermined surface of the radiator, and a control unit configured to acquire position information and time information of the plurality of pixels that have detected the Cherenkov light based on a signal output from the light detection unit, and configured to obtain a track of the charged particles based on the acquired position information and the acquired time information, and a propagation locus of the Cherenkov light in the radiator.