The present invention provides a neural network calculation processing device that can perform a product-sum operation more quickly and efficiently with a simple design while suppressing an increase in circuit scale. A neural network calculation processing device (1) comprises a first product-sum calculator (10), a register (20) connected to the first product-sum calculator (10), and a second product-sum calculator (30) connected to the register (20). The first product-sum calculator (10) includes a first memory (11), a second memory (12), a first multiplier (13), a first adder (14), and a first output unit (15). The second product-sum calculator (30) includes an input unit (31), a third memory (32), second multipliers (33-1, 33-2), second adders (34-1, 34-2), and second output units (35-1, 35-2).
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