A housing of an air cleaner includes a housing body, which has a wall portion formed of a plastic molding and is configured such that an opening is formed in a part of the wall portion, and an adsorption sheet, which is fixed to a peripheral portion of the opening and closes the opening. The adsorption sheet includes an outer fiber molding, an inner fiber molding, which is provided at a position inward of the outer fiber molding, and an adsorbent, which is located between the outer fiber molding and the inner fiber molding and adsorbs fuel vapor of the internal combustion engine.