<p>A prefabricated summerhouse comprises: column parts which have upper and lower columns inserted into multiple foundation stones on the bottom and standing on the foundation stones so that the summerhouse has an equilateral polygonal shape; a connection unit which includes connecting bars connecting outer end parts of upper columns of the column parts and a fence connecting the inner sides of the lower columns; a ridge unit which has a ridge base formed in the center of the upper column at a higher position than an end part of an upper column to connect an end part of upper column which is a connection part between the connecting bars of the connection unit with the ridge at a predetermined inclination; a roof unit which includes an insertion bar inserted into a side surface of a ridge of a ridge unit in a sliding manner and a slate formed on one side of the insertion bar so that the slate is coupled in the center between the ridges to cover a gap between the ridges; and a cover unit which includes a ridge cover inserted on both sides of the ridge in a sliding manner to cover an upper side of the ridge into which the insertion bars of the roof unit are inserted, an end cap formed on an end part of the ridge cover to be inserted and coupled to the ridge cover, and a base cover formed on an upper side of the ridge base which is an apex of the roof unit.</p>
