Manufacturing method for optical unit and manufacturing method for optical module

A manufacturing method for an optical unit including

• a first optical element configured to collimate or shape incident light from a light source, and
• a second optical element configured to diffuse or shape irradiation light from the first optical element, the manufacturing method comprising:
• molding a first wafer in which a plurality of the first optical elements are formed;
• molding a second wafer in which a plurality of the second optical elements are formed;
• forming a bonding portion with a predetermined adhesive in a first peripheral portion provided surrounding the first optical element in the first wafer or a second peripheral portion corresponding to the first peripheral portion, provided surrounding the second optical element in the second wafer;
• bonding the first wafer and the second wafer with the bonding portion to seal the first optical element and/or the second optical element with the first wafer and the second wafer;
• and
• cutting the first wafer and the second wafer at the first peripheral portion and the second peripheral portion in a state where the first wafer and the second wafer are bonded to each other to dice an optical unit including the first optical element and the second optical element, wherein
• the adhesive in the bonding portion formed in the forming the bonding portion is in a semi-cured state.