Semiconductor storage device and semiconductor storage unit

A semiconductor storage unit, comprising:

• a first substrate including a first layer and a second layer on the first layer;
• a memory chip on the first layer;
• a controller disposed on the first layer and configured to control the memory chip;
• molding resin that covers the first layer, the memory chip, and the controller;
• and
• a thermal conductive sheet, wherein
• the second layer of the first substrate includes:
• a conductive pattern including a plurality of terminals, and
• an insulating layer partially covering the conductive pattern and the first layer,
• at a part of the first layer not covered by the insulating layer, one or both of the conductive pattern and the insulating layer form first concaves at predetermined intervals, and
• the conductive sheet covers the first concaves and a part of the insulating layer.