A terminal connection structure comprising: a pair of tab terminals (62, 63) that are provided on a base housed in a housing; and a pair of terminal portions (62c, 63c) that are provided in the tab terminals (62, 63) in parallel and that are each exposed from the housing so as to be capable of being connected to an external terminal, characterized in that the terminal connection structure further comprises: a terminal unit which includes said pair of tab terminals (62, 63), a plate sandwiched between the pair of tab terminals (62, 63), a pair of springs which are disposed between the terminal portions (62c, 63c) of the pair of tab terminals (62, 63) so as to sandwich the external terminal between a respective terminal portion (62c, 63c) and a respective spring portion of a respective spring by a spring force of the respective spring, a position restricting plate that is provided with a through hole at the center thereof and terminal holes (64b, 64c) on both sides thereof, the terminal portions (62c, 63c) of the pair of tab terminals (62, 63) being inserted into said terminal holes (64b, 64c) provided in said position restricting plate to restrict positions of the terminal portions (62c, 63c), and an insulating member which is placed between the terminal portions (62c, 63c), the insulating member comprising an insulating wall which is disposed between the terminal portions (62c, 63c) of the pair of tab terminals (62, 63), said springs being partitioned by the insulating wall of the insulating member, wherein said terminal unit including said pair of tab terminals (62, 63), said plate, said pair of springs, said position restricting plate and said insulating member is adapted to be replaceably installed on the base. a pair of tab terminals (62, 63) that are provided on a base housed in a housing; and a pair of terminal portions (62c, 63c) that are provided in the tab terminals (62, 63) in parallel and that are each exposed from the housing so as to be capable of being connected to an external terminal, characterized in that the terminal connection structure further comprises: a terminal unit which includes said pair of tab terminals (62, 63), a plate sandwiched between the pair of tab terminals (62, 63), a pair of springs which are disposed between the terminal portions (62c, 63c) of the pair of tab terminals (62, 63) so as to sandwich the external terminal between a respective terminal portion (62c, 63c) and a respective spring portion of a respective spring by a spring force of the respective spring, a position restricting plate that is provided with a through hole at the center thereof and terminal holes (64b, 64c) on both sides thereof, the terminal portions (62c, 63c) of the pair of tab terminals (62, 63) being inserted into said terminal holes (64b, 64c) provided in said position restricting plate to restrict positions of the terminal portions (62c, 63c), and an insulating member which is placed between the terminal portions (62c, 63c), the insulating member comprising an insulating wall which is disposed between the terminal portions (62c, 63c) of the pair of tab terminals (62, 63), said springs being partitioned by the insulating wall of the insulating member, wherein said terminal unit including said pair of tab terminals (62, 63), said plate, said pair of springs, said position restricting plate and said insulating member is adapted to be replaceably installed on the base. a terminal unit which includes said pair of tab terminals (62, 63), a plate sandwiched between the pair of tab terminals (62, 63), a pair of springs which are disposed between the terminal portions (62c, 63c) of the pair of tab terminals (62, 63) so as to sandwich the external terminal between a respective terminal portion (62c, 63c) and a respective spring portion of a respective spring by a spring force of the respective spring, a position restricting plate that is provided with a through hole at the center thereof and terminal holes (64b, 64c) on both sides thereof, the terminal portions (62c, 63c) of the pair of tab terminals (62, 63) being inserted into said terminal holes (64b, 64c) provided in said position restricting plate to restrict positions of the terminal portions (62c, 63c), and an insulating member which is placed between the terminal portions (62c, 63c), the insulating member comprising an insulating wall which is disposed between the terminal portions (62c, 63c) of the pair of tab terminals (62, 63), said springs being partitioned by the insulating wall of the insulating member, wherein said terminal unit including said pair of tab terminals (62, 63), said plate, said pair of springs, said position restricting plate and said insulating member is adapted to be replaceably installed on the base.