The present invention provides a liquid container having a container body, and a liquid injection port provided on the container body for injecting a liquid into the inside of the container body; one surface side of the accommodating container is provided with an opening portion; a first film is mounted along the entire circumference of the opening so as to cover the opening, and a liquid containing chamber communicating with the liquid injection port is provided on the inner side of the first film; a long groove is provided on a side wall of the container body and an outer side surface of a side wall which is different from the side provided with the opening; the long groove is covered with a second film, and a first communication path communicating with the liquid storage chamber is formed between the long groove and the second film; a slot and a groove are formed in a top surface in a posture when the container body is used; the third film is mounted on the top surface so as to cover the slot and the groove so as to form a second communication path in communication with the atmosphere.