An imaging apparatus includes an imaging device and a processor. The processor is configured to determine brightness of an image when the imaging apparatus is operating in a second operation mode. The processor is configured to increase imaging sensitivity of the imaging device when the processor determines that the brightness is darker than or equal to a first brightness. The processor is configured to cause the imaging apparatus to operate in a first operation mode when the processor determines that the brightness is darker than or equal to a second brightness darker than the first brightness after the processor increases the imaging sensitivity.