Provided is a resin container that has a simple structure and is more reliably improved in liquid retention. A resin and cylindrical mouth part 3 which forms a flow path through which contents in the container body pass and has a male screw on an outer diameter surface, and a resin cap 4 which has a top plate part and a cylindrical part continuous to an outer peripheral part of the top plate part and in which a female screw capable of being screwed with the male screw is formed on an inner diameter surface of the cylindrical part, The cap 4 has an annular outer ring 10 extending in a circumferential direction on an inner surface side outer peripheral part of the top plate part, and the outer ring 10 has an annular inner peripheral surface facing an inner diameter side, The top plate part side has an annular...

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