PURPOSE: To display a conception adjusting body temperature by checking infrared rays generated from an eardurm in an auditory pit with an infrared detector to detect a body temperature data.

CONSTITUTION: An antenna 2 is provided on a body temperature transmitter 11 with an inserting part 1a having an infrared detector formed long as opposed to an eardrum in an auditory pit. A body temperature receiver 3 is equipped with an antenna 4 which receives a radio wave transmitted to the body temperature receiver 3 from the antenna 2 of the body temperature transmitter 1. It is also provided with a display surface 5 to display the degree of body temperature, a display surface 6 to display changes in the body temperature and display lamps 7, 8 and 9 which display a conception possible date, non-conception possible date and a dangerous date by difference in color respectively. The body temperature receiver 3 computes an average body temperature to be stored for 30 days and displays it separately. The conception day, ovulation day and the like are computed to display and the display lamps 7, 8 and 9 are lit on corresponding days.