PROBLEM TO BE SOLVED: To suppress a power consumption.SOLUTION: A human body detection device is a human body detection device for detecting a human body, and includes: a human body detection part for detecting the human body; and a power supply state switching part for switching from a first movement mode for moving from the first state to a second state in which the consumption power is smaller than the first state according to the detection of the human body by the human body detection part when the human body detection device is not operated and a state in which the human body detection device detects the human body continues for a predetermined time, to a second movement mode for moving from the first state to the second state according to the condition other than the detection of the human body.SELECTED DRAWING: Figure 5