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 . <EOS>