A biophysiological detector for collecting biophysiological information on a subject by measuring the load on a bed where the subject exists&period； The load on a bed &lpar；1&rpar； where the subject exists is measured&comma； the frequency distribution and the magnitude of variation &lpar；amplitude&rpar； are determined from a waveform indicative of the variation of the measured load and then the biophysiological information on the subject is acquired from these data&period； More specifically&comma； a frequency appearing noticeably in a first frequency region is regarded as the respiration rate and a frequency appearing noticeably in a second frequency region higher than the first frequency region is regarded as the pulse rate&period； The subject is judged to be snoring if the variation in a thirst frequency region higher than the second frequency region increases&period； The subject judged to cough if the variation increases suddenly&period； Furthermore&comma； the subject is judged to turn from side to side if the variation of the load exceeds a specified level&period；
