To provide a laminated metal plate and its manufacturing method capable of shortening a joining time and obtaining sufficient joint strength.
A bottom plate (laminated metal plate) 13 has a refrigerant pathway 11 inside thereof. The bottom plate 13 includes a lower metal plate 15 having a first groove section 19 recessed downward, and a first recessed section 21 disposed along a peripheral edge of the first groove section 19 and recessed upward, and an upper metal plate 17 stacked on an upper side of the lower metal plate 15, and having a second groove section 23 recessed upward at a position opposed to the first groove section 19 of the lower metal plate 15, and configuring the refrigerant pathway 11 with the first groove section 19. The lower metal plate 15 is welded to the upper metal plate 17 along the peripheral edge of the first groove section 19 between the first recessed section 21 and the first groove section 19.
YAMAMOTO YOSHITAKA
SATO YOSHIKAZU
OKURA SATORU
Masataka Otani
Tamagushi Yukihisa