Operation member, input device, and production method of resin molded article

A production method of a resin molded article including a first resin member having a plate shape and formed of a material that transmits laser light, and a second resin member having a tubular shape and formed of a material that absorbs the laser light, the production method comprising:

• disposing the first resin member in an opening included in the second resin member such that an outer circumferential portion of the first resin member is placed over a bonding projection provided in the second resin member to project from an inner circumferential surface of the opening toward an inner diameter side of the second resin member;
• and
• laser-welding the outer circumferential portion of the first resin member to the bonding projection of the second resin member by irradiating the bonding projection of the second resin member with laser light through the outer circumferential portion of the first resin member, wherein
• the bonding projection includes a thick portion provided on an outer diameter side of the bonding projection, and a thin portion provided to project from the thick portion toward the inner diameter side of the bonding projection.