A liquid container comprises a container body (1) and a cap (2). A circular tubular neck portion (12) of the container main body (1) is formed to have an outer diameter dimension greater than a maximum diameter dimension of a nozzle portion (14), and a locking protrusion (124) for the cap (2) is provided on an outer peripheral surface of the circular tubular neck portion. The cap (2) has a pair of lockable arms (24). During an operation of attaching the cap (2) to the container body (1), the lockable arms (24) are locked onto the locking protrusion (12a). Opposing surfaces (26) of the lockable arms (24) are formed as guide surfaces which are adapted, during the cap attaching operation, to come into contact with the outer peripheral surface of the circular tubular neck portion (12) to guide the cap (2) along the circular tubular neck portion (12) so as to allow a plug protrusion (22) of the cap (2) and a nozzle hole (14a) to become opposed to each other.
