The invention provides an outer blade for a hair cutting device and the hair cutting device. The outer blade (100) for a hair cutting device, the outer blade (100) being mounted to an end of a main body of the hair cutting device, includes bars (101) that each have a shape of a rectangular stick and are arranged at predetermined intervals. The outer blade (100) also includes, at a skin-surface-contact-side first face (111) of each of the bars (101), an agent holding part (102) configured to hold an agent that is a substance having a predetermined effect on a skin surface, the agent holding part (102) being a surrounded recess heading from the skin-surface-contact-side first face (111) of the bar (101) toward an inner-blade-side second face (112) of the bar (101). Thus, the agent such as foam or gel can be held by the agent holding part (102) at the skin-surface-side face of the outer blade (100), and friction can be reduced between the outer blade (100) and the skin surface by the agent held by the agent holding part (102).