A light source apparatus includes: a first light source; a second light source configured to emit light having a dimming resolution lower than a dimming resolution of the first light source; a holder configured to hold the first light source and the second light source on a first surface of the holder; a substrate provided to face a second surface of the holder, the second surface being different from the first surface, and a circuit configured to control driving of the first light source and the second light source being mounted on the substrate; a first wiring configured to electrically connect the first light source and the substrate; and a second wiring configured to electrically connect the second light source and the substrate, wherein a length of the first wiring is shorter than a length of the second wiring.