Connector

1. A connector, comprising:

a housing comprising at least one terminal accommodating chamber, and at least one lance projecting into the terminal accommodating chamber and capable of withdrawing from the terminal accommodating chamber due to elastic deformation of the lance;

at least one terminal which can be inserted into the terminal accommodating chamber, the terminal having a terminal contact part formed on a leading side thereof for contact with a mating terminal and an engagement part formed for engagement with the lance; and

a front holder fitted to a front part of the housing to move between a formal engagement position and a temporary engagement position to hold the terminal contact part, wherein

in the process of inserting the terminal into the terminal accommodating chamber, the lance is elastically deformed in a direction to withdraw from the terminal accommodating chamber to allow the terminal to be inserted into the terminal accommodating chamber,

in a terminal's position where an insertion of the terminal into the terminal accommodating chamber is completed, the lance is elastically recovered to engage with the engagement part, and

the housing is provided with an opening which exposes an engagement point between the lance and the engagement part in a direction generally perpendicular to an elastically-deformable direction of the lance.

2. The connector according to claim 1 , wherein

the opening is opened when the front holder is in the temporary engagement position, while the opening is closed up when the front holder is in the formal engagement position.

3. The connector according to claim 1 , wherein

the housing comprises two juxtaposed terminal accommodating chambers, two lances projecting into the terminal accommodating chambers respectively, and a lance-deformation permissible space defined between the two juxtaposed terminal accommodating chambers and also used for elastic deformation of the two lances for the terminal accommodating chambers,

the terminals are accommodated opposite each other in the two juxtaposed terminal accommodating chambers, and

the engagement parts of the terminals are shifted from each other in a width direction of the terminal and established in respective positions so that the two lances would not interfere with each other under condition of being deformed elastically.

4. The connector according to claim 1 , wherein

the lance is formed so as to extend in an inserting direction of the terminal, and

the opening exposes an engagement point between the lance and the engagement part in a direction generally perpendicular to the lance.