An imaging apparatus, for capturing a subject image and recording image data on a recording medium, includes: a recording medium connector configured to attach the recording medium detachably; a communication host connected to the recording medium connector via a first communication bus, configured to access the recording medium via the first communication bus to write data to the recording medium or read data from the recording medium; and a processor configured to control power supply, wherein in a case where a period in which the communication host does not access the recording medium is equal to or longer than a predetermined period, the processor stops power supply to the recording medium and the recording medium connector, and stops power supply to the communication host.