A container with a lid comprises a container portion (10) having an opening portion (11) for the loading or unloading of a sample or the like, a lid portion (20) that can be detachably fitted in said opening portion (11) so as to close the same, and a lever mechanism portion (30) for opening said lid portion (20) in a closed state using leverage. The lever mechanism portion (30) is composed of a lever portion (33) having a force-applied point (P) portion that is pressed by a finger and an action point (Q) portion that is pressed against an external periphery portion of said lid portion (20) when pressed with the finger so as to open the same, and a support portion (31, 32) for supporting said lever portion (33) via a thin-walled portion (35) that constitutes a fulcrum (O)portion, in a freely swinging manner. The lever mechanism portion (30) allows the lid portion (20) to be easily opened with one hand without putting much burden on the fingers even if it is very tightly closed. In addition, a lock mechanism portion (70) is provided that locks the lid portion (20) when it is closed. Optionally, in response to a closing operation of the lid portion (20), the lid portion (20) is automatically locked by the lock mechanism portion (70), and in response to an opening operation of the lid portion (20) by the lever mechanism portion (60), the locking of the lid portion (20) by the lock mechanism portion (70) is automatically released.
