Electric connection box and method of assembling same

1. An electric connection box comprising:

a box body;

a provisionally-attaching portion provided on the box body for provisionally attaching a first connector, connected to a wire harness, to the box body, the first connector being disposed in a receiving space; and

a circuit unit including a second connector adapted to be mounted on the box body,

wherein when the circuit unit is mounted to the box body, the first connector is detached from the provisionally-attaching portion and is connected to the second connector and the circuit unit replaces the first connector in the receiving space.

2. The electric connection box according to claim 1 , wherein

the provisionally-attaching portion is formed on a wall portion of the box body forming the receiving space for receiving the circuit unit, and

when the circuit unit is received in the receiving space, the provisionally-attaching portion is disposed between the wall portion and the circuit unit.

3. The electric connection box according to claim 2 , wherein

the provisionally-attaching portion includes a guide rib which is formed on the wall portion and extends in a direction in which the first connector is inserted, and

the first connector includes a guide groove for sliding engagement with the guide rib.

4. The electric connection box according to claim 3 , wherein

the provisionally-attaching portion includes a pair of side ribs provided at opposite sides of the guide rib, respectively, and

the first connector includes a pair of side guides for engagement respectively with the pair of side ribs.

5. The electric connection box according to claim 3 , wherein

the provisionally-attaching portion includes retaining projections having a generally semi-circular cross-section formed respectively on a pair of overhang portions formed respectively on opposite sides of the guide rib, and

the first connector includes retaining steps for being retained respectively by the retaining projections formed respectively on flange walls of the guide groove.

6. A method of assembling an electric connection box comprising the steps of:

provisionally-attaching a first connector connected to a wire harness to a provisionally-attaching portion provided on a box body such that the first connector is received in a receiving space;

transporting the box body in a state that the first connector is provisionally-attached to the provisionally-attaching portion;

detaching the first connector from the provisionally-attaching portion and mounting a circuit unit, including a second connection, in the receiving space of the box body; and

connecting the first connector to the second connector.