A laminate type evaporator in which a large number of refrigerant tubes including at least a pair of first and second refrigerant flow passages are laminated together, comprising: a refrigerant tube group in which a pair of first and second upper tank portions are respectively arranged at one end of the first and second refrigerant flow passages and in which a pair of first and second lower tank portions are respectively arranged at the other end of the first and second flow passages; a refrigerant inlet (Rin) arranged on the first upper tank portion side of the refrigerant tube at one end (101 F) of the refrigerant tube group; a refrigerant outlet (Rout) arranged on the second upper tank portion side of the refrigerant tube at said one end; a first partition portion arranged in the first lower tank portions of the refrigerant tube group; a second partition portion arranged in the second upper tank portions of the refrigerant tube group, a first side refrigerant passage communicating the refrigerant inlet with the first lower tank portion of the refrigerant tube at said one end; characterized in that a second side refrigerant passage is positioned at the other end of the refrigerant tube group with respect to the second partition portion and is configured to communicate the first upper tank portion and the second upper tank portion of the refrigerant tube with each other; a third side refrigerant passage is positioned at said other end with respect to the first partition portion and is configured to communicate the first lower tank portion and the second lower tank portion of the refrigerant tube with each other; and wherein the first partition portion and the second partition portion are arranged such that they divide the refrigerant tube group into three refrigerant flow passage groups (B11, B12, B13) sequentially circulating refrigerant introduced from the refrigerant inlet from the first lower tank portion of the refrigerant tube at said one end to the second upper tank portion of the refrigerant tube at said one end, the refrigerant is branched to flow from a front half portion of the first upper tank portions in a front half portion of the first lower tank portions and the second side refrigerant passage, a portion of the refrigerant having flown in the second side refrigerant passage flows through a rear half portion of the second upper tank portions in a rear half portion of the second lower tank portions, another portion of the refrigerant having flown in the rear half portion of the first lower tank portions flows through the third side refrigerant passage in the rear half portion of the second lower tank portions, and the portion and the another portion of the refrigerant join with each other at the rear half portion of the second lower tank portions. a refrigerant tube group in which a pair of first and second upper tank portions are respectively arranged at one end of the first and second refrigerant flow passages and in which a pair of first and second lower tank portions are respectively arranged at the other end of the first and second flow passages; a refrigerant inlet (Rin) arranged on the first upper tank portion side of the refrigerant tube at one end (101 F) of the refrigerant tube group; a refrigerant outlet (Rout) arranged on the second upper tank portion side of the refrigerant tube at said one end; a first partition portion arranged in the first lower tank portions of the refrigerant tube group; a second partition portion arranged in the second upper tank portions of the refrigerant tube group, a first side refrigerant passage communicating the refrigerant inlet with the first lower tank portion of the refrigerant tube at said one end; characterized in that a second side refrigerant passage is positioned at the other end of the refrigerant tube group with respect to the second partition portion and is configured to communicate the first upper tank portion and the second upper tank portion of the refrigerant tube with each other; a third side refrigerant passage is positioned at said other end with respect to the first partition portion and is configured to communicate the first lower tank portion and the second lower tank portion of the refrigerant tube with each other; and wherein the first partition portion and the second partition portion are arranged such that they divide the refrigerant tube group into three refrigerant flow passage groups (B11, B12, B13) sequentially circulating refrigerant introduced from the refrigerant inlet from the first lower tank portion of the refrigerant tube at said one end to the second upper tank portion of the refrigerant tube at said one end, the refrigerant is branched to flow from a front half portion of the first upper tank portions in a front half portion of the first lower tank portions and the second side refrigerant passage, a portion of the refrigerant having flown in the second side refrigerant passage flows through a rear half portion of the second upper tank portions in a rear half portion of the second lower tank portions, another portion of the refrigerant having flown in the rear half portion of the first lower tank portions flows through the third side refrigerant passage in the rear half portion of the second lower tank portions, and the portion and the another portion of the refrigerant join with each other at the rear half portion of the second lower tank portions.