| 摘要 |
A light irradiation device according to an embodiment includes a light emitting element, and a substrate on which the light emitting element is mounted. The substrate includes a laminated body constituted so that a plurality of insulating layers are laminated, a first heat transfer member disposed in the laminated body so that a part thereof is located directly below the light emitting element, and a second heat transfer member disposed between the insulating layers so as to surround the first heat transfer member when seen in a plan view. Thermal conductivities of the first heat transfer member and second heat transfer member are higher than a thermal conductivity of the laminated body.
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