Electrical connection box

1. An electrical connection box, comprising:

a body;

a mounting member attached to the body;

a lock arm which is provided at one of the body and the mounting member, the lock arm including:

an arm portion; and

a first engaging portion provided at the arm portion;

a lock receiving portion which is provided at the other of the body and the mounting member, the lock receiving portion including:

a receiving portion which has an inserting port to receive the arm portion as the arm portion first enters the receiving portion; and

a second engaging portion provided at a surface of the receiving portion so as to be engaged with the first engaging portion,

wherein the arm portion extends generally in an inserting direction in which the arm portion enters into the receiving portion;

wherein the receiving portion includes a projection which projects from the surface of the receiving portion farther than the second engaging portion from the inserting port so as to abut on the arm portion to locate the lock arm in a predetermined position.

2. The electrical connection box according to claim 1 , wherein one of the first engaging portion and the second engaging portion has a through hole; and

wherein the other of the first engaging portion and the second engaging portion has a convex shape.

3. The electrical connection box according to claim 1 , wherein one of the first engaging portion and the second engaging portion has a concave shape; and

wherein the other of the first engaging portion and the second engaging portion has a convex shape.

4. The electrical connection box according to claim 1 , wherein a plurality of the projections are provided so as to hold the arm portion therebetween.

5. The electrical connection box according to claim 1 , wherein a plurality of the projections are provided in such a manner that the projections are spaced to each other along the surface of the receiving portion.

6. The electrical connection box according to claim 1 , a clearance is formed between an outer wall providing the lock arm and an outer wall providing the lock receiving portion.

7. The electrical connection box according to claim 1 , wherein the body and the mounting member are rotatably connected together at their one ends through a hinge; and

wherein the lock arm and the lock receiving portion are provided at the other ends of the body and the mounting member.

8. The electrical connection box according to claim 1 , wherein the body includes a first board having a first connector;

wherein the mounting member includes a second board having a second connector; and

wherein when the mounting member is attached to the body, the first connector is fitted to the second connector so that the first board is electrically connected to the second board.

9. The electrical connection box according to claim 1 , wherein the receiving portion has a tubular shape.