POWER SUPPLY SYSTEM AND POWER SUPPLY DEVICE

This power supply system (1) is provided with a robot (100) that is equipped with an electric storage device (103), a movable power supply device (200), and a control device, wherein: the power supply device (200) is equipped with a first electrical connection unit (201) that is capable of being electrically connected to a second electrical connection unit (104) of the robot (100) and that is electrically connected to an electricity supply source via a cable; and the control device establishes an electrical connection between the first electrical connection unit (201) and the second electrical connection unit (104) on the basis of information indicative of the amount of electricity stored in the electric storage device (103), and then performs control to supply electricity to the robot (100). 供电系统(1)具备：机器人(100)，具备蓄电装置(103)；供电装置(200)，能够移动；以及控制装置，所述供电装置(200)具备第一电连接部(201)，所述第一电连接部(201)能够与所述机器人(100)的第二电连接部(104)电连接且经由有线而与电力供给源电连接，所述控制装置基于与所述蓄电装置(103)的蓄电量有关的信息，进行用于将所述第一电连接部(201)和所述第二电连接部(104)电连接并向所述机器人(100)供电的控制。