In LED lamp unit, a flat LED body has a light emitting part at a front surface side, and a pair of terminal parts at a rear surface side. Each of a pair of busbars includes a busbar body which is provided with a lock piece which locks the LED body and a contact spring piece which contacts the terminal part. A lock part provided at a free end side of the contact spring piece is inserted through a hole in the busbar body. A lens member accommodates an LED connection body in which the LED body is assembled to the pair of busbars. The LED connection body includes locked parts engaged with the lock parts, and an inner wall surface to which the lock part is press-contacted in a direction opposite to the terminal part in a state where the locked parts are engaged with the lock parts.