PURPOSE: To obtain a bottle from which its liquid contents can easily be squeezed out and which can be used with a sense of safety by a method wherein, by a mere pressing action, the bottle is opened and closed and its liquid contents are discharged and an easy judgement is made as to whether or not the bottle is opened by tampering.

CONSTITUTION: The bottle is opened and closed substantially by a reversible valve body 7, a sealing stopper 17 which cannot be uncorked unless an outer ring 22 is removed is fitted firmly and closely into a discharge cylinder 4 of a main cap 1 forming a discharge opening, an exact judgement is made as to whether or not the bottle is opened through tampering by taking a look at the condition of the outer ring 22, the liquid contents are squeezed out by a mere pressing action against the body part of the bottle and the bottle is closed by a mere releasing of the pressing action.