To provide means capable of changing a method of using a space by changing a door fixation position according to the purpose of the use without the need for a space to house a door used to partition the space.SOLUTION: There is provided a space expansion structure of a condominium such that in a condominium living space formed by arranging a straight passage from an entrance to a living room and spaces to be used for different purposes on both sides of the straight passage, a door for a space on one side is arranged in the space on the one side arranged along the straight passage while the door for the space on the one side is substantially wide enough to be opened and closed pivotally on a one-side end edge of the straight passage; and a door for a space on the other side is further arranged in the space on the other side arranged along the straight passage while the door for the space on the other side is substantially wide enough to be opened and closed pivotally on the one-side end edge of the straight passage.SELECTED DRAWING: Figure 1
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