Each detecting pulse beat tuning from the consecutive time interval which corresponds and, analyzing pulse beat tuning which is detected to each time interval between the pulse beats which it continues, you indicate the possibility of atrial fibrillation from thing, or and the decision result which decide the possibility of atrial fibrillation you include with the fact that it decides that atrial fibrillation does not exist, method and the device which decide that possibility or atrial fibrillation of atrial fibrillation does not exist.連続する脈拍間の各時間間隔に各々対応する一連の時間間隔から脈拍調律を検出することと、検出された脈拍調律を分析して、心房細動の可能性を判定することと、判定結果から心房細動の可能性を指示するか、または心房細動の存在しないことを判定することとを含む、心房細動の可能性または心房細動の存在しないことを判定する方法および装置。