An image forming apparatus (100) includes a human sensor (10), an image forming section (20), an internal sensor (30), a power supply section (40), a controller (50), and a communication section (60). The internal sensor (30) includes a first internal sensor (31) and a second internal sensor (32). The first internal sensor (31) detects a quantity that varies by operation of the image forming section (20). The second internal sensor (32) detects a state of operation of the image forming section (20). In a power saving state, the controller (50) controls, based on a result detected by the human sensor (10), the power supply section (40) to supply electric power to the first internal sensor (31) and not to supply electric power to the second internal sensor (32).

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