Abstract: A cap is engaged with a container at two positions, one being a fitting section between the container and an elastic ring body provided inside of the cap to be deformable from outside of the cap, the other being an engaging section between the container and engaging pieces provided on the cap. An engaging strength of the fitting section is set stronger than an engaging strength of the engaging section. The engagement at the fitting section is released when the elastic ring body is pushed from outside of the cap and deformed.

Abstract: [Problem] To provide a container with a cap that is easy to take off and that can increase airtightness inside a container body. [Solution to Problem] A container comprises a container body having an opening 8 in an upper end and a cap 3 having a top section 3b and a tubular body section 3a assembled with an elastic ring body 4. The elastic ring body has push buttons 13 that are formed on a peripheral surface of the elastic ring body and are exposed from the inside to the outside of the tubular body section. A cone section 6 is formed on at least one of the container body and the elastic ring body so as to expand to the lower side thereof. The container comprises an engaging section (9, 16) that engages the tubular body section with the container body in a predetermined positional relationship, and a fitting section (10, 14) that fits the elastic ring body to the container body.