PLATE HEAT EXCHANGER AND HEAT PUMP DEVICE EQUIPPED WITH SAME

On the assumption that, of the heat transfer plate at the front two heat transfer plates adjacent to each other in the stacking direction, is defined as a first heat transfer plate and the heat transfer plate at the rear is defined as a second heat transfer plate, a portion of the headers of the first heat transfer plate and the second heat transfer plate is provided with a non-flow passage region where the headers are in contact with each other and no fluid can pass through. The peripheral edge of the non-flow passage region of the first heat transfer plate has a protrusion that protrudes upward, and the peripheral edge of the non-flow passage region of the second heat transfer plate has a recess that is recessed downward. A space portion of the protrusion and a space portion of the recess overlap in the stacking direction to form a cavity, and the plate portions forming the cavity are provided with a communication port that allows the cavity to communicate with the outside. 在将沿层叠方向邻接的2张导热板中的正面侧的导热板设为第1导热板、将