A jet solder bath (20, 20A, 20B, 20C) comprising: a first jet nozzle for injecting molten solder by a first pump; a second jet nozzle (40, 60, 80) for injecting the molten solder by a second pump, the second jet nozzle (40, 60, 80) being arranged on a downstream side of the first jet nozzle along a carrying direction of a substrate; and a bridge member (50, 50A, 50B, 50C) arranged between the first and second jet nozzles, the bridge member (50, 50A, 50B further including: a guide portion (51, 51B, 51C) for guiding at least one of flows of the molten solder injected from the first jet nozzle and flowing to the downstream side of the first jet nozzle and of the molten solder injected from the second jet nozzle (40, 60, 80) and flowing to an upstream side of the second jet nozzle (40, 60, 80), and side members (52, 52B, 52C) for controlling the flow of the molten solder, the side members (52, 52B, 52C) being arranged near opposite ends of the guide portion (51, 51B, 51C) across a direction that is perpendicular to the carrying direction of the substrate, the jet solder bath (20, 20A, 20B, 20C) being characterized in that: the bridge member extends from a vicinity of the upper end on the upstream end of the second jet nozzle (40, 60, 80) to a vicinity of the upper end on the downstream end of the first jet nozzle, and wherein the jet solder bath (20B, 20C) further comprises an attaching portion (54B, 54c) which attaches the bridge member (50B, 50C) to the second jet nozzle (60, 80) for changing the attachment height of the bridge member (50B, 50C) from the second jet nozzle (60, 80), and/or wherein the jet solder bath further comprises a rotation portion which rotates the bridge member to the second jet nozzle. a first jet nozzle for injecting molten solder by a first pump; a second jet nozzle (40, 60, 80) for injecting the molten solder by a second pump, the second jet nozzle (40, 60, 80) being arranged on a downstream side of the first jet nozzle along a carrying direction of a substrate; and a bridge member (50, 50A, 50B, 50C) arranged between the first and second jet nozzles, the bridge member (50, 50A, 50B further including: a guide portion (51, 51B, 51C) for guiding at least one of flows of the molten solder injected from the first jet nozzle and flowing to the downstream side of the first jet nozzle and of the molten solder injected from the second jet nozzle (40, 60, 80) and flowing to an upstream side of the second jet nozzle (40, 60, 80), and side members (52, 52B, 52C) for controlling the flow of the molten solder, the side members (52, 52B, 52C) being arranged near opposite ends of the guide portion (51, 51B, 51C) across a direction that is perpendicular to the carrying direction of the substrate, the jet solder bath (20, 20A, 20B, 20C) being characterized in that: the bridge member extends from a vicinity of the upper end on the upstream end of the second jet nozzle (40, 60, 80) to a vicinity of the upper end on the downstream end of the first jet nozzle, and wherein the jet solder bath (20B, 20C) further comprises an attaching portion (54B, 54c) which attaches the bridge member (50B, 50C) to the second jet nozzle (60, 80) for changing the attachment height of the bridge member (50B, 50C) from the second jet nozzle (60, 80), and/or wherein the jet solder bath further comprises a rotation portion which rotates the bridge member to the second jet nozzle. a guide portion (51, 51B, 51C) for guiding at least one of flows of the molten solder injected from the first jet nozzle and flowing to the downstream side of the first jet nozzle and of the molten solder injected from the second jet nozzle (40, 60, 80) and flowing to an upstream side of the second jet nozzle (40, 60, 80), and side members (52, 52B, 52C) for controlling the flow of the molten solder, the side members (52, 52B, 52C) being arranged near opposite ends of the guide portion (51, 51B, 51C) across a direction that is perpendicular to the carrying direction of the substrate, the jet solder bath (20, 20A, 20B, 20C) being characterized in that: the bridge member extends from a vicinity of the upper end on the upstream end of the second jet nozzle (40, 60, 80) to a vicinity of the upper end on the downstream end of the first jet nozzle, and wherein the jet solder bath (20B, 20C) further comprises an attaching portion (54B, 54c) which attaches the bridge member (50B, 50C) to the second jet nozzle (60, 80) for changing the attachment height of the bridge member (50B, 50C) from the second jet nozzle (60, 80), and/or wherein the jet solder bath further comprises a rotation portion which rotates the bridge member to the second jet nozzle. the bridge member extends from a vicinity of the upper end on the upstream end of the second jet nozzle (40, 60, 80) to a vicinity of the upper end on the downstream end of the first jet nozzle, and wherein the jet solder bath (20B, 20C) further comprises an attaching portion (54B, 54c) which attaches the bridge member (50B, 50C) to the second jet nozzle (60, 80) for changing the attachment height of the bridge member (50B, 50C) from the second jet nozzle (60, 80), and/or wherein the jet solder bath further comprises a rotation portion which rotates the bridge member to the second jet nozzle.