Cleaning composition for oral appliance

A cleaning composition for an oral appliance, comprising the following components (A) and (B):

• (A) an unsaturated fatty acid having 10 or more and 20 or less carbon atoms or a salt thereof in an amount of 0.5 mass % or more and 14 mass % or less in terms of the fatty acid;
• and
• (B) one or more surfactants selected from the group consisting of an anionic surfactant (b1), a nonionic surfactant (b2), and an amphoteric surfactant (b3), wherein
• the component (b1) is one or more selected from the group consisting of an N-acyl amino acid, N-acyl taurine, and an α-olefinsulfonic acid, and salts thereof,
• the component (b2) is one or more selected from the group consisting of polyoxyethylene hydrogenated castor oil, sorbitan fatty acid ester, fatty acid polyoxyethylene sorbitan ester, sucrose fatty acid ester, and alkyl glycoside,
• the component (b3) is one or more selected from the group consisting of betaine acetate, cocamidoalkyl betaine, alkyl sulfobetaine, imidazolinium betaine, carboxybetaine, alkylimidazoline betaine salt, and alkylamine oxide, and
• the composition has a pH at 25° C. of 5.5 or higher and 14 or lower.