A power unit (10) includes a centrifugal clutch characteristics storage module (603) configured to store centrifugal clutch characteristics indicating a relationship between rotation speeds of a centrifugal clutch upstream path and clutch torque capacities of a centrifugal clutch, a centrifugal clutch characteristics estimation module (601) configured to estimate the centrifugal clutch characteristics, a centrifugal clutch characteristics updating module (602) configured to update the centrifugal clutch characteristics stored in the centrifugal clutch characteristics storage module (603) to the centrifugal clutch characteristics estimated by the centrifugal clutch characteristics estimation module (601), and a driving force control module (654) configured to control a driving force of a driving wheel based on the centrifugal clutch characteristics read out from the centrifugal clutch characteristics storage module (603).