Mask outer frame unit, mask unit, band-including mask unit and mask outer frame

A mask outer frame unit comprising:

• a mask outer frame configured to mount on a mask attached to a face of a patient;
• and
• a pad configured to abut against the face of the patient;
• wherein:
• the mask outer frame includes a forehead contact portion that is disposed so as to make the pad abut against a forehead of the patient;
• the forehead contact portion includes an adjustment portion to which the pad is configured to attach removably and that is configured to adjust at least one of an angle of the pad with respect to the forehead contact portion and a position of the pad with respect to the forehead contact portion;
• the adjustment portion includes an attachment portion configured to attach the pad thereto, the attachment portion including a pair of engagement recesses that extend in a predetermined direction along a face of the forehead contact portion, the predetermined direction configured to be a left-right direction of the face of the patient when worn by the patient;
• one of the pair of engagement recesses has a first opening portion, the first opening portion being disposed to partially overlap with a first end portion, in the left right direction, of the forehead contact portion;
• the other of the pair of engagement recesses has a second opening portion, the second opening portion being disposed to partially overlap with a second end portion, in the left-right direction, of the forehead contact portion opposite to the first end portion;
• and
• the pair of engagement recesses constitutes through holes or through grooves that pass through the forehead contact portion from a side where the pad is attached to an opposite side of the forehead contact portion.