Abstract: Pulse motors rotating at periods corresponding to physical rhythm, rhythm of sentiment and rhythm of intellect are provided and discs having a pin eccentrically extending are coupled, respectively, with output axes of pulse motors so as to convert rotation movement into reciprocation movement through T-shaped piston rods. Plungers having ball point pens are respectively provided on the T-shaped piston rods. Data put in by digital switches are stored and calculated by the guide number to determine rotation angle of the pulse motors to set the ball point pens at the starting position. At the first recording area for the first date of a month arriving below the ball point pen, the pulse motors are initiated in their rotation from the starting position within a proper period thereof and a coil is energized so that the ball point pen will come in contact with the recording paper for drawing up the biorhythm chart.