An openable container (10), comprising a container main body (11), an opening and closing cover (23) installed swingably on the container main body (11), and a plate rubber (50) installed at a swingable portion between the container main body (11) and the opening and closing cover (23), wherein a locking piece (32) of the opening and closing cover (23) is engaged with an engaging projection (33) provided on a working body (55) of the container main body (11), a movable body (60) is provided slidably on the container main body (11), a fitting recessed part (51) is provided at the lower end of the working body (55), and a fitting projection part (61) is provided on the movable body (60), whereby the working body (55) is prevented from being lowered by sliding the movable body (60) to displace the fitting recessed part (51) from the fitting projection part (60), and the opening and closing cover (23) is not opened even if a child tampers with the cover unintentionally.