Image reading apparatus

An image reading apparatus configured to read an image of a sheet, comprising:

• a platen glass configured to support the sheet on one surface of the platen glass;
• a moving member configured to be movable in a sub-scanning direction along the other surface of the platen glass;
• an image reader supported by the moving member, the image reader including:
• a reading surface facing the other surface of the platen glass;
• a plurality of light-receiving elements aligned in a main scanning direction orthogonal to the sub-scanning direction;
• a substrate facing the reading surface from an opposite to the platen glass and including a circuit board in which each of the light-receiving elements is arranged;
• and
• a case holding the substrate;
• a transmission member arranged between the image reader and the moving member;
• and
• a first biasing portion configured to bias the image reader in a first direction which is a direction approaching the platen glass,
• wherein the moving member includes a facing surface that faces the substrate from an opposite to the reading surface,
• wherein the case includes:
• a first wall which extends toward the moving member and which is adjacent to one of two edges, of the reading surface, extending in the main scanning direction;
• and
• a second wall which holds the substrate between the second wall and the first wall, which extends toward the moving member, and which is adjacent to the other of the edges, of the reading surface, extending in the main scanning direction,
• wherein the transmission member includes:
• a first contacting portion which makes a contact with an end of the first wall in the first direction, wherein the end of the first wall is located at a position adjacent to the substrate;
• a second contacting portion which makes a contact with an end of the second wall in the first direction, wherein the end of the second wall is located at a position adjacent to the substrate;
• and
• a connecting portion which faces the substrate and which extends in the sub-scanning direction to connect the first contacting portion and the second contacting portion, and
• wherein one end of the first biasing portion makes a contact with the facing surface of the moving member and the other end of the first biasing portion makes a contact with the connecting portion of the transmission member.