Electronic circuit module

1. An electronic circuit module comprising:

a circuit board having an electronic component mounted thereon; and

a metal cover that covers the circuit board,

wherein the metal cover includes:

a top plate that opposes the circuit board, and

a plurality of attachment legs that extend from the top plate and that are joined to the circuit board,

wherein a plurality of electrode lands are provided on the circuit board, each of the electrode lands being joined to a corresponding one of the attachment legs,

wherein each of the attachment legs includes:

a fixing portion joined to a corresponding one of the electrode lands,

an insertion portion that extends so as to project from the fixing portion,

a clearance portion provided near a base of the insertion portion, and

a contact portion that is in contact with a surface of the circuit board,

wherein an insertion hole in which the insertion portion is inserted is provided in each of the electrode lands and in the circuit board, and

wherein the circuit board includes a non-electrode portion at a location at which the contact portion is in contact with the circuit board; and

wherein the non-electrode portion comprises an electrode-free portion of a corresponding one of the electrode lands, the electrode-free portion being a portion in which the corresponding one of the electrode lands is absent.

2. The electronic circuit module according to claim 1 , the electrode-free portion is provided in the corresponding one of the electrode lands.

3. The electronic circuit module according to claim 1 , wherein the electrode-free portion is provided so as to extend from the outer periphery to the inside of the corresponding one of the electrode lands.