Hinged door inner frame and door structure for which the inner frame is used

It is possible to easily and freely change a hinged side and an opening direction of a door when or after a resident moves into a house. Detachable inner frames having doorstop portions, flat portions, and locking nails are mounted to locking grooves in left and right vertical outer frames through spacers and a door main body is mounted to the heelpost side flat portion through hinges. By dividing a doorframe into vertical outer frames and inner frames, in order to change a hinged side of the door, inner frames are pulled out from the vertical outer frames and inserted into the locking grooves in the vertical outer frames after changing orientation of the inner frames according to the hinged side or exchanging the inner frames for inner frames suitable for the hinged side and the opening direction to thereby easily change the hinged side of the door main body.