To obtain a conductive connection terminal with improved soldering strength to a conductive member, and to obtain a circuit breaking device having the connection terminals and capable of certainly breaking a circuit for a short time to protect an electrical component.

A first but bar 11 and a second bus bar 19 are respectively formed with groove parts 4 on solder junction faces 3 of the bus bar 11, 19 joined to a thermite case 26 by solder, i.e., a low-melting point metal 23. Thereby, when the solder is melted by heat, the solder spreads the whole surface of each the solder junction face 3 to certainly join the bus bars 11, 19 to the thermite case 26, while storage of the solder in the groove part 4 certainly forms a solder layer to increase mechanical strength of the soldering, and can prevent spreading of the solder or protruding outside the solder junction face 3 as compared to the case that the solder junction face 3 is flat.