PROBLEM TO BE SOLVED: To provide a switching circuit that prevents the occurrence of ringing, and medical equipment and the like that allows stably treating fluid.SOLUTION: A switching circuit includes: a multilayer wiring board and a first transistor, a second transistor, and a capacitor that are mounted at a first wiring layer side of the multilayer wiring board. The multilayer wiring board has: first wiring, second wiring, third wiring, and fourth wiring that are formed in the first wiring layer fifth wiring that is formed in a second wiring layer a first via conductor that electrically connects the third wiring and the fifth wiring and a second via that electrically connects the fourth wiring and the fifth wiring. A drain electrode of the first transistor is connected to the first wiring, and a source electrode of the first transistor is connected to the second wiring. A drain electrode of the second transistor is connected to the second wiring, and a source electrode of the second transistor is connected to the third wiring. A first electrode of the capacitor is connected to the first wiring, and a second electrode of the capacitor is connected to the fourth wiring.COPYRIGHT: (C)2014,JPO&INPIT【課題】リンギングの発生を抑制したスイッチング回路、及び、安定して流体を取り扱える医療機器等を提供すること。【解決手段】多層配線基板と、多層配線基板の第1配線層側に実装される第1トランジスター、第2トランジスター及びコンデンサーと、を含み、多層配線基板は、第1配線層に形成された第1配線、第2配線、第3配線及び第4配線と、第2配線層に形成された第5配線と、第3配線と第5配線とを電気的に接続する第1ビア導体と、第4配線と第5配線とを電気的に接続する第2ビア導体と、を有し、第1トランジスターのドレイン電極は第1配線と、ソース電極は第2配線と接続され、第2トランジスターのドレイン電極は2配線と、ソース電極は3配線と接続され、コンデンサーの第1電極は第1配線と、第2電極は第4配線と接続されている、スイッチング回路。【選択図】図3
