To provide a magnetoencephalograph and an SQUID sensor in which flux traps in an SQUID sensor are eliminated efficiently.A magnetoencephalograph 1 includes a dewar 7 accommodating liquefied helium 5, a detection coil 8 generating a current corresponding to the magnetic field of the brain of the subject P, a liquefaction inside the dewar 7 connected to the detection coil 8 And a SQUID sensor 6 immersed in the helium 5. The SQUID sensor 6 comprises a superconducting element 33 for converting a current from the detection coil 8 into an electric signal, a heater 37 for heating the superconducting element 33, a superconducting element And a covering portion 41 which covers the element 33 and the heater 37 so as to make them non-contact with the liquefied helium 5.(FIG.【課題】SQUIDセンサにおける磁束トラップの解消が効率良く行われる脳磁計及びSQUIDセンサを提供する。【解決手段】脳磁計1は、液化ヘリウム5が収容されるデュワー7と、被験者Pの脳の磁場に対応して電流を発生する検出コイル8と、検出コイル8に接続されデュワー7内の液化ヘリウム5に浸漬されたSQUIDセンサ6と、を備え、SQUIDセンサ6は、検出コイル8からの電流を電気信号に変換する超伝導素子33と、超伝導素子33を加熱するヒータ37と、超伝導素子33とヒータ37とを液化ヘリウム5と非接触にするように一緒に覆う被覆部41と、を有する。【選択図】図2
