Plate-type heat exchanger and method for producing same

A plate-type heat exchanger comprising:

• a housing;
• the housing comprising:
• a plurality of rectangular box components each having the same shape and having a standing wall section along a peripheral edge, and one of the rectangular box components is layered on another of the rectangular box components reversed in the horizontal direction to form a layered structure having an upper layer component and a lower layer component such that an upper portion of a standing wall section of the lower layer component of the layered structure is fit into a lower portion of a standing wall section of the upper layer component of the layered structure, and the angle (θ) of the standing wall sections with respect to a vertical direction of an upper side-flat portion is 15°≤θ≤30°, and a contact region between the upper portion of the standing wall section and the lower portion of the standing wall section is joined by solid phase diffusion bonding;
• wherein a fin having a cross-sectional shape of a triangle or trapezoid or rectangle and having its tip located at the same position as an upper side-flat portion of the rectangular box components with respect to a height direction is formed at the upper side-flat portion of the rectangular box components, and
• a tip of the fin of the lower layer component makes contact with the tip of the fin of the upper layer component.