A conductor connection tool, comprising: a housing; a conduction fitting (40, 50) formed in a substantially U shape including a bottom plate portion (42, 52), a vertical portion (44, 54) bent vertically upward from one end of the bottom plate portion (42, 52), and an attachment portion (45, 55) extending from an upper end of the vertical portion (44, 54) in parallel to the bottom plate portion (42, 52), and having a terminal portion (46, 56) extending in the opposite direction to the attachment portion (45, 55), the conduction fitting (40, 50) being accommodated in a fitting recessed part of the housing; and a plate spring bent in a substantially V shape with one side serving as an attachment piece to be fixed to the attachment portion (45, 55) of the conduction fitting (40, 50) with the other side serving as a locking piece whose front end is to be brought into pressure contact with a locking claw portion (43, 53) on the bottom plate portion (42, 52) of the conduction fitting (40, 50), wherein by pushing in the locking piece of the plate spring via an operation hole provided on the front surface side of the housing so as to be elastically deformed, inserting a conductor from a conductor insertion hole provided on the front surface side of the housing, and then elastically returning the locking piece, the conductor is nipped by the bottom plate portion (42, 52) of the conduction fitting (40, 50) and the front end of the locking piece of the plate spring, characterized in that the terminal portion (46, 56) is bent upward in such a manner that a roll surface (46a, 56a) becomes a contact surface.. a housing; a conduction fitting (40, 50) formed in a substantially U shape including a bottom plate portion (42, 52), a vertical portion (44, 54) bent vertically upward from one end of the bottom plate portion (42, 52), and an attachment portion (45, 55) extending from an upper end of the vertical portion (44, 54) in parallel to the bottom plate portion (42, 52), and having a terminal portion (46, 56) extending in the opposite direction to the attachment portion (45, 55), the conduction fitting (40, 50) being accommodated in a fitting recessed part of the housing; and a plate spring bent in a substantially V shape with one side serving as an attachment piece to be fixed to the attachment portion (45, 55) of the conduction fitting (40, 50) with the other side serving as a locking piece whose front end is to be brought into pressure contact with a locking claw portion (43, 53) on the bottom plate portion (42, 52) of the conduction fitting (40, 50), wherein by pushing in the locking piece of the plate spring via an operation hole provided on the front surface side of the housing so as to be elastically deformed, inserting a conductor from a conductor insertion hole provided on the front surface side of the housing, and then elastically returning the locking piece, the conductor is nipped by the bottom plate portion (42, 52) of the conduction fitting (40, 50) and the front end of the locking piece of the plate spring, characterized in that the terminal portion (46, 56) is bent upward in such a manner that a roll surface (46a, 56a) becomes a contact surface..