An LED device to be connected to a connector having a plurality of metal springs arranged to make two rows, the LED device comprising: a pair of metal contacts; a device body made of plastic by insert-molding the metal contacts to have a recess on an upper surface thereof, one ends of the pair of metal contacts being exposed adjacent to each other at a bottom of the recess of the device body, the other ends of the pair of metal contacts protruding from a lower surface of the device body, each of the other ends forming a plurality of terminal portions which are adjacent to each other to collectively make a plate shape perpendicular to the lower surface, the plate shape extending along the lower surface in accordance with a shape of each of the rows; and LED bare chips placed in the recess of the device body and mounted directly on the one ends of the pair of metal contacts, wherein power supply to the bare chips and heat dissipation from the bare chips are carried out through the metal contacts, when the LED device is connected to the connector, the terminal portions are configured to come in contact with the rows of the metal springs, respectively, to effectively carry out the power supply and the heat dissipation, wherein each of the other ends forming n (n ≥ 2) terminal portions which are adjacent to each other to make the plate shape, each of the metal contacts being divided into n (n ≥ 2) according to the terminal portions, the bare chips being mounted directly on the one ends of the metal contacts, respectively, wherein the connector further has a housing defining two elongated holes, the metal springs being provided in plurality corresponding to each of the elongated holes, and wherein the terminal portions are formed to be insertable in the elongated holes, respectively, the plate shape are configured to be inserted into the elongated holes, the terminal portions coming into contact with contact portions of the metal springs when the LED device is connected to the connector. a pair of metal contacts; a device body made of plastic by insert-molding the metal contacts to have a recess on an upper surface thereof, one ends of the pair of metal contacts being exposed adjacent to each other at a bottom of the recess of the device body, the other ends of the pair of metal contacts protruding from a lower surface of the device body, each of the other ends forming a plurality of terminal portions which are adjacent to each other to collectively make a plate shape perpendicular to the lower surface, the plate shape extending along the lower surface in accordance with a shape of each of the rows; and LED bare chips placed in the recess of the device body and mounted directly on the one ends of the pair of metal contacts, wherein power supply to the bare chips and heat dissipation from the bare chips are carried out through the metal contacts, when the LED device is connected to the connector, the terminal portions are configured to come in contact with the rows of the metal springs, respectively, to effectively carry out the power supply and the heat dissipation, wherein each of the other ends forming n (n ≥ 2) terminal portions which are adjacent to each other to make the plate shape, each of the metal contacts being divided into n (n ≥ 2) according to the terminal portions, the bare chips being mounted directly on the one ends of the metal contacts, respectively, wherein the connector further has a housing defining two elongated holes, the metal springs being provided in plurality corresponding to each of the elongated holes, and wherein the terminal portions are formed to be insertable in the elongated holes, respectively, the plate shape are configured to be inserted into the elongated holes, the terminal portions coming into contact with contact portions of the metal springs when the LED device is connected to the connector.