A heat exchanger including plate fins and, the tubes fins being stacked at respective intervals relative to one another, and heat exchanger tubes penetrating the fins in a fin-stacking direction. The heat exchanger exchanges heat between fluids flowing, respectively, inside and outside the heat exchanger tubes, through the heat exchanger tubes and the fins. Each of the fins includes cut-raised portions with a bridge shape having leg and beam segments. The cut-raised portions associated with each of the heat exchanger tubes are located substantially only in a region of the fin satisfying Ws=(1-.phi.)Dp+.phi.D .phi.>0.5, where Ws is spread width of the cut-raised portions in a direction (column direction) extending along an end of the fin on the upstream side of the second fluid, and D is outer diameter of the heat exchanger tube. Dp is alignment pitch of the heat exchanger tubes in the column direction.