Light emitting device

A light emitting device comprising:

• a base comprising:
• a main body, and
• a frame disposed on an upper surface of the main body;
• one or more laser elements disposed on the upper surface of the main body and positioned inward of the frame;
• a cover comprising:
• a support member that is fixed on an upper surface of the frame and has an opening inside the frame, and
• a light transmissive portion disposed so as to close the opening;
• and
• a lens body disposed above the light transmissive portion;
• wherein the support member comprises:
• a first step having an upper surface and a lateral surface, and
• a second step having an upper surface and a lateral surface, the second step being positioned lower than the first step;
• wherein
• the lens body is disposed on the upper surface of the second step of the support member;
• the light transmissive portion is positioned inward of the lateral surface of the second step,
• a lower surface of the transmissive portion is lower than the upper surface of the second step;
• and
• a difference between a thermal expansion coefficient of the light transmissive portion and a thermal expansion coefficient of the lens body is smaller than a difference between a thermal expansion coefficient of the light transmissive portion and a thermal expansion coefficient of the main body.