Circuit board with convex shaped post, light emitting device, and manufacturing method therefor

A circuit board comprising:

• a first board including a flat plate portion and a post portion having a convex shape protruding from the flat plate portion;
• and
• a second board including
• a base material,
• a circuit pattern including a pair of electrodes disposed on a first surface of the base material,
• a metal layer disposed on a second surface of the base material opposite to the first surface, and
• an adhesive member disposed on a surface of the metal layer opposite to a surface proximate to the base material,
• the second board defining an opening portion extending through the base material in a thickness direction, wherein
• the post portion is arranged in the opening portion with a top surface of the post portion is exposed from the second board, the top surface of the first board excluding the post portion and the metal layer in the second board facing each other with the adhesive member being interposed therebetween,
• a thickness of the adhesive member between the flat plate portion of the first board and the metal layer is in a range from 20 μm to 100 μm,
• in a plan view, the second board includes a base material exposed portion where the base material protrudes in a direction toward the opening portion further than the circuit pattern and is exposed from the circuit pattern,
• in a cross-sectional view, the base material exposed portion is exposed from the metal layer,
• the adhesive member is disposed between a lateral surface of the post portion and the second board, and
• the top surface of the post portion, a top surface of the adhesive member disposed between the post portion and the second board, and a top surface of the circuit pattern are flush with each other.