Electronic circuit board fastening member

A fastening member for an electronic circuit board, including:

• an elastically deformable leg formed in a case for housing the electronic circuit board;
• and
• a projection formed continuous with the leg to be engaged with the electronic circuit board so as to fasten the electronic circuit board on a prescribed mounting surface in the case;
• wherein the improvement comprises:
• the projection is engaged with the electronic circuit board such that a prescribed non-zero angle is formed between a surface of the projection contacting the electronic circuit board and a surface of the electronic circuit board contacting said contacting surface of the projection, when the electronic circuit board is fastened on the mounting surface in the case;
• and
• when the electronic circuit board is fastened on the mounting surface in the case, the electronic circuit board is positioned over an area of the case, and the elastically deformable leg is positioned in the case outside of the area of the case under the electronic circuit board.