A lighting apparatus includes: a bulb; a heat sink unit disposed in an inner space of the bulb, and including an end wall portion and a sleeve portion; a light-emitting unit disposed on the heat sink unit and including a first circuit board disposed on the end wall portion, a second circuit board disposed around the sleeve portion, and a plurality of light-emitting elements; a heat insulating unit disposed at at least one of a position between the end wall portion and the first circuit board, and a position between the sleeve portion and the second circuit board; an annular seat coupled to the bulb; and an electrical connector coupled to the annular seat.