Terminal unit, terminal device, and power supply system having the same

PROBLEM TO BE SOLVED: To provide a terminal unit which can shorten a length of an electric wire for electrically connecting an external circuit to a power supply path, and to provide a terminal device and a power supply system including the terminal device.SOLUTION: A terminal unit 20 includes: first terminal parts 21; second terminal parts; and a unit body 23. Each first terminal part 21 mechanically holds a second end part of a core wire 11 and is electrically connected with the core wire 11. Each second terminal part is electrically connected with the first terminal part 21 and connects an electric wire 7. The unit body 23 holds the first terminal parts 21 and the second terminal parts. The unit body 23 has guide grooves 231 and a tensile force receiving part 232. The guide grooves 231 are formed over an area between both ends of a front surface 233 of the unit body 23 in an extension direction. The tensile force receiving part 232 receives a tensile force acting by a power supply path 1 on the unit body 2