A deviation between an inlet-outlet temperature difference of a first superheater part and an inlet-outlet temperature difference of each of second superheater parts can be reduced so that a difference in thermal expansion between the first superheater part and the second superheater part can be reduced. It is therefore possible to avoid damage on heat transfer pipes. A solar collector for a solar heat boiler is provided with: cylindrical headers (1,3,5) which are connected to opposite end portions of heat transfer pipes; and a solar heat collection portion including the heat transfer pipes and membrane bars fixing the heat transfer pipes to one another; wherein: the cylindrical headers include an inlet header (1) into which a fluid to be heated flows, an intermediate header (3) which is disposed in a position opposed to the inlet header (1) with interposition of the heat transfer pipes, and two outlet headers (5,5) which are provided to extend on opposite end sides of the inlet header and through which the fluid from the intermediate header can be discharged to the outside; and the solar heat collection portion includes a first superheating portion (2) which has a group of the heat transfer pipes connected between the inlet header (1) and the intermediate header (3) so as to form a center region of the solar heat collection portion, and second superheating portions (4,4) which have groups of the heat transfer pipes connected between the intermediate header (3) and the two outlet headers (5) so as to be formed on opposite sides of the first superheating portion (2) respectively.