Developer storage container, developing device, image forming apparatus and substrate support structure

A developer storage container comprising:

• a container wall;
• a substrate member having a first surface and a second surface opposite to each other;
• and
• a storage portion provided on the container wall and storing the substrate member,
• wherein the storage portion comprises:
• an outer surrounding wall provided on the container wall;
• a first support portion disposed inside the outer surrounding wall, the first support portion supporting the first surface of the substrate member;
• a second support portion disposed inside the outer surrounding wall and connected to the container wall, the second support portion supporting the first surface of the substrate member;
• and
• a lid portion fixed to the outer surrounding wall and having an opening through which the substrate member is exposed, the lid portion contacting the second surface of the substrate member,
• wherein the lid portion includes a first protrusion and a second protrusion protruding in a second direction perpendicular to a first direction from the substrate member to the container wall;
• wherein a distance between the first protrusion and the second protrusion in the second direction is shorter than a length of the substrate member in the second direction;
• and
• wherein the outer surrounding wall has a through-hole disposed so as to face the second support portion.