An opening/closing body control apparatus includes: a load estimation unit that estimates a load caused to an opening/closing body during an opening operation or a closing operation; a first filter that removes at least noise from a waveform of the estimated load obtained by the load estimation unit; a second filter that removes, from the waveform of the estimated load, frequencies lower than those removed by the first filter; an offset calculation unit that calculates an offset value of the estimated load based on an output of the first filter; and an entrapment determination unit that performs an entrapment determination for the opening/closing body. Moreover, the entrapment determination unit is configured to: monitor whether entrapment has started based on an output of the second filter; and perform the entrapment determination based on the offset value fixed when the start of entrapment is detected and the output of the first filter.