The present invention relates to a lamp unit employing a high-efficiency heat radiation solution for an LED light source, and a lighting device and a vehicle lamp using the same, and the lamp unit comprises an LED light source, a support part for supporting the LED light source, a transfer part facing the LED light source, and a connection part for connecting the support part and the transfer part, wherein the support part, the connection part and the transfer part are provided as thermal conductive members and emit heat of the LED light source to the outside in the form of conduction energy and radiation energy.