A power supply unit for an aerosol inhaler includes: a power supply able to discharge power to a load for generating an aerosol from an aerosol source; a control unit configured to control the power supply; and a sensor configured to output a value related to a remaining amount of the power supply. The control unit detects a short circuit of the power supply based on an output value of the sensor.一種霧氣吸嚐器用的電源單元包括:電源,其能夠放電給用於從霧氣源產生霧氣的負載;控制單元,其經組配成控制該電源;以及感測器,其經組配成輸出與該電源之剩餘量相關的數值。該控制單元基於該感測器的輸出值來偵測該電源的短路。