| 摘要 |
PROBLEM TO BE SOLVED: To provide a door frame adjustable in length of a door head and capable improving connecting performance among the frame materials, and to provide an opening structure appropriately using the door frame.SOLUTION: A door frame 1 includes: a door head 20; and a pair of vertical frames 10 and 14, which are connected to each other by using joint auxiliary parts 22, 23, 11, and 15. The door head 20 is adjustable in length by cutting off at a halfway in a longitudinal direction into plural door head members 25, 26, and 27, which are the parts of the door head divided into plural parts being adjusted in length. The parts of the door head 20 are connected to each other by using a joint member 28 in a state that cut end faces are abutted on each other. The joint member 28 is positioned to bridge across the door head members 25, 26, and 27 to connect the members to each other. |
