An endoscope light source sub-system according to the present invention is provided with: a first light source which emits a first light to be supplied to an endoscope； a second light source which emits a second light having the same color component as the first light and lower dimming resolution than the first light source； a column-shaped holder which holds the first and second light sources on a first surface； a substrate which is provided facing a second surface of the holder, the second surface differing from the first surface, and in which a circuit that controls the driving of the first and second light sources is mounted on the substrate； a first wiring which electrically connects the first light source and the substrate； a second wiring which electrically connects the second light source and the substrate, and has an extended length that is longer than the extended length of the first wiring； and a heat radiating part which releases, to the outside, heat that is emitted by the first and second light sources and is transmitted through the holder. The holder is formed having: a first communication part which extends in the normal direction of the first surface so that the first surface and the second surface are in communication with each other, and into which the first wiring is inserted； and a second communication part that extends in the normal direction of the first surface so that the first surface and the second surface are in communication with each other, and into which the second wiring is inserted.La présente invention concerne un sous-système de source de lumière pour endoscope, comprenant : une première source de lumière qui émet une première lumière à fournir à un endoscope ； une seconde source de lumière qui émet une seconde lumière ayant une composante de couleur égale à celle de la première lumière et une résolution de gradation inférieure à celle de la première source de lumière ； un support en forme de colonne qui maintient les première et s
