Abstract: According to the present invention, disclosed is a pipe fluid heat exchange flat pipe, which has a cross section having a width direction size that is larger than the size in the height direction thereof, extends in a longitudinal direction, and has a plurality of flat parts and curved parts that are alternately formed, wherein a plurality of lower guides protruding from the inner lower surface of the flat pipe toward the upper side thereof and upper guides protruding from the inner upper surface of the flat pipe toward the lower side thereof are alternately provided in the width direction of the flat pipe, and either the lower guide or the upper guide has an overlapping part overlapped with the other from either of the adjacent lower guide or upper guide in the height direction of the flat pipe.