To provide a connector unit capable of improving reliability of a product by changing a structure.

The connector unit includes a first connector 410 which can be connected to a printed-circuit board and includes a first connector body 411 of which an insertion port is formed on one side and a first terminal part 413 arranged inside the insertion port, and a second connector which can be connected to the first connector and includes a second connector body 451 of which on a first side face a second terminal part 452 that is inserted in the insertion port and can be electrically connected to the first terminal part is formed, and a first fixed projection 453a and a second fixed projection 454 that are formed on the upper side and the lower side of the second connector body and are engaged with the upper side and the lower side edge parts of the insertion port.