Power source circuit shut off device

A power source circuit shut off device comprising:

• a plug having a terminal metal fitting and a housing to which the terminal metal fitting is attached;
• and
• a plug attachment section having a second terminal metal fitting to be connected to the terminal metal fitting and a second housing to which the second terminal metal fitting is attached,
• wherein a first opening section for inserting the second terminal metal fitting is provided at a bottom face of the housing at a second housing side;
• wherein the housing has a second opening section for attaching the terminal metal fitting to the housing, the second opening section being provided on a side face of the housing perpendicular to the bottom face;
• wherein the housing is brought into close to the second housing, and a tip portion of the second terminal metal fitting is advanced into the innermost side of the terminal metal fitting from a terminal contact position at which the tip portion of the second terminal metal fitting is first brought into contact with the terminal metal fitting before the housing is accommodated in the second housing, and thereby the housing is positioned at a complete fitting position at which the housing is accommodated in the second housing and the second opening section is closed by the second housing;
• and
• wherein a closing wall is provided so as to protrude from an edge of an insertion hole through which the housing is inserted into the second housing, and closes the second opening section in a state that the housing is positioned at the terminal contact position.