Optical coupling device

An optical coupling device, comprising:

• a leadframe;
• a light-emitter located on the leadframe;
• a light-receiver located at a position facing the light-emitter, the light-receiver receiving light generated from the light-emitter;
• a first resin located on the leadframe, the first resin including
• a first portion surrounding the light-emitter when viewed along a first direction, the first direction connecting the light-emitter and the light-receiver, and
• a second portion positioned between the first portion and the light-emitter when viewed along the first direction, a first thickness along the first direction of the first portion being greater than a second thickness along the first direction of the second portion, wherein the first thickness is not less than 1 μm and not more than 35 μm, and wherein the second thickness is not less than 0.1 μm and not more than 20 μm;
• a second resin located between the light-emitter and the light-receiver in the first direction, the second resin being light-transmissive;
• a third resin located between the second resin and the light-receiver in the first direction, the third resin being light-transmissive;
• and
• a fourth resin housing the light-emitter, the light-receiver, the first resin, the second resin, and the third resin, the fourth resin being light-shielding,
• the first portion being provided in a ring shape when viewed along the first direction,
• an outer perimeter end portion of the second resin being surrounded by the first portion when viewed along the first direction,
• the third resin contacting the second resin and the leadframe.