VEHICULAR LIGHTING DEVICE AND VEHICULAR LIGHTING FIXTURE

To provide a vehicular lighting device that can suppress variance in position of a heat transfer part, and also suppress dust produced when the heat transfer part is inserted into a recessed part from entering into between the heat transfer part and a bottom surface of the recessed part, and a vehicular lighting fixture.SOLUTION: A vehicular lighting device comprises: a socket which has a first recessed part on one end part side; a heat transfer part which is provided inside the first recessed part; a light emission module which has a light emitting element, and is provided on the surface of the heat transfer part on the opposite side from the bottom surface side of the first recessed part; a projection part which is provided on at least one of a side face of the first recessed part and a side face of the heat transfer part; and a second recessed part which is open in the bottom surface of the first recessed part. The projection part is positioned inside the second recessed part in plan view.SELECTED DRAWING: Figure 4 【課題】伝熱部の位置のばらつきを抑制することができ、且つ、伝熱部を凹部の内部に挿入した際に発生したゴミが、伝熱部と凹部の底面との間に侵入するのを抑制することができる車両用照明装置、および車両用灯具を提供することである。【解決手段】実施形態に係る車両用照明装置は、一方の端部側に第１の凹部を有するソケットと；前記第１の凹部の内部に設けられた伝熱部と；発光素子を有し、前記伝熱部の、前記第１の凹部の底面側とは反対側の面に設けられた発光モジュールと；前記第１の凹部の側面、および、前記伝熱部の側面の少なくともいずれかに設けられた凸部と；前記第１の凹部の底面に開口する第２の凹部と；を具備している。平面視において、前記凸部が、前記第２の凹部の内部に位置している。【選択図】図４