An aerosol generation system comprising: a controller for an inhalation device, the controller including a first power supply, a first connector, a first resistor and a first processor configured to perform energization control of a heater which is used to heat an aerosol source, and a power supply device including a second power supply, a second connector which is electrically connected to the first connector at the time of charging of the first power supply, a second resistor and a second processor configured to perform control of power supply from the second power supply to the controller via the second connector, the first processor has a first operation mode in which charging of the first power supply can be performed, and a first sleep mode in which power consumption is lower than in the first operation mode, the second processor has a second operation mode in which the control of power supply can be performed, and a second sleep mode in which power consumption is lower than in the second operation mode, characterised in that the second processor includes a voltage detection terminal connected to a voltage source via the second resistor, and shifts from the second sleep mode to the second operation mode in a case where a voltage detected at the voltage detection terminal of the second processor changes from High level to Low level as detection of an electrical connection between the first connector and the second connector, and then starts power supply to the controller, the first processor shifts from the first sleep mode to the first operation mode in accordance with the start of the power supply by the second processor, and the voltage detection terminal of the second processor is connected to a ground line via the first resistor in a case where the first connector is connected to the second connector, and the voltage detected at the voltage detection terminal of the second processor changes from High level to Low level in accordance with connecting the voltage detection terminal of the second processor to the ground line. a controller for an inhalation device, the controller including a first power supply, a first connector, a first resistor and a first processor configured to perform energization control of a heater which is used to heat an aerosol source, and a power supply device including a second power supply, a second connector which is electrically connected to the first connector at the time of charging of the first power supply, a second resistor and a second processor configured to perform control of power supply from the second power supply to the controller via the second connector, the first processor has a first operation mode in which charging of the first power supply can be performed, and a first sleep mode in which power consumption is lower than in the first operation mode, the second processor has a second operation mode in which the control of power supply can be performed, and a second sleep mode in which power consumption is lower than in the second operation mode, characterised in that the second processor includes a voltage detection terminal connected to a voltage source via the second resistor, and shifts from the second sleep mode to the second operation mode in a case where a voltage detected at the voltage detection terminal of the second processor changes from High level to Low level as detection of an electrical connection between the first connector and the second connector, and then starts power supply to the controller, the first processor shifts from the first sleep mode to the first operation mode in accordance with the start of the power supply by the second processor, and the voltage detection terminal of the second processor is connected to a ground line via the first resistor in a case where the first connector is connected to the second connector, and the voltage detected at the voltage detection terminal of the second processor changes from High level to Low level in accordance with connecting the voltage detection terminal of the second processor to the ground line.