The present invention relates to a seamless can and a coated metal sheet that can be used to form the seamless can. The seamless can includes an inner surface coating film at least on a can inner surface side. The inner surface coating film has an excellent coating film covering property and corrosion resistance. When the inner surface coating film contains a polyester resin and a total amount of polyvalent carboxylic acid components in the polyester resin is 100 mol%, a content of an aromatic dicarboxylic acid is 70 mol% or more. The inner surface coating film has a gel fraction (A) represented by Formula below of less than 90%: Gel fraction (A) = (W2a/W1a) × 100 (%) ... (1a),
where W1a represents a mass of the inner surface coating film isolated from a coated metal substrate cut out from the seamless can, and W2a represents a mass of the isolated inner surface coating film after being immersed in MEK at ordinary temperature for 60 minutes and then taken out and dried.