Light emitting device

A light emitting device comprising:

• a first light emitting element mounting unit comprising:
• a first substrate made of a conductive material and comprising a first surface and a second surface opposite to the first surface;
• a first light emitting element configured to emit light and mounted on the first surface of the first substrate;
• and
• a first substrate holder which supports the first substrate and comprises:
• a first column which faces a side surface of the first substrate and extends in a thickness direction of the first light emitting element and the first substrate;
• and
• a first protrusion which extends from the first column toward the first light emitting element and which is bonded to the first surface of the first substrate;
• a second light emitting element mounting unit comprising:
• a second substrate made of a conductive material and comprising a first surface and a second surface opposite to the first surface;
• a second light emitting element configured to emit light and mounted on the first surface of the second substrate;
• and
• a second substrate holder which supports the second substrate and comprises:
• a second column which faces a side surface of the second substrate and extends in a thickness direction of the second light emitting element and the second substrate;
• and
• a second protrusion which extends from the second column toward the second light emitting element and which is bonded to the first surface of the second substrate,
• wherein the second light emitting element mounting unit is stacked on the first light emitting element mounting unit such that the second column of the second substrate holder is bonded to the first column of the first substrate holder and the first light emitting element is bonded to the second surface of the second substrate via a first bonding material.