A waste liquid container includes an accommodating case which includes a mounting surface which is an external surface that faces internally in a mounting direction and a first side surface and a second side surface which are outside surfaces extending in a direction intersecting a width direction, a waste liquid introducing portion which is connected to a discharging portion, and a circuit board including a connecting terminal which is electrically connected to a substrate connecting portion. The accommodating case includes a recessed portion which opens on the mounting surface and the first side surface and allows a projecting portion to be inserted therein, when being mounted on the mounting portion, and a notch which opens on the mounting surface and the second side surface vertically below the waste liquid introducing portion. The connecting terminal is disposed inside the recessed portion.