Semiconductor memory and substrate unit

Abstract

One embodiment provides a semiconductor memory device and substrate unit that can improve the degree of freedom. [Solution] A semiconductor memory device according to one embodiment comprises a first substrate and a second substrate. The first substrate has a first portion, a second portion that is thinner than the first portion, and a plurality of first conductive portions provided in the second portion. The second substrate has a plurality of second conductive portions. The plurality of second conductive portions overlap with the plurality of first conductive portions when viewed from a first direction which is the thickness direction of the first substrate, and are each connected to the plurality of first conductive portions by solder.

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