hollow shaft for rotatably supporting the solar ray collecting portion and a vertical hollow rotating shaft elongated in a direction perpendicular to the horizontal hollow shaft and supporting the same unitarily a drive means rotatably moves the solar ray collecting portion mounted on the horizontal hollow shaft around the same application_number US 64939884 A description fig1 is a perspective view for explaining an embodiment of the solar ray collecting device previously proposed by the present applicant in fig1 is a cylindrical foundation and 2 is a transparent dome shaped head portion the capsule 3 of the solar ray collecting device consists of the foundation and the head portion when the device is used a solar ray collecting portion 10 is accommodated in the capsule 3 as shown in fig1 the solar ray collecting portion 10 is comprised of a large number of for instance 19 lenses 11 arranged concentrically for collecting solar rays a solar ray direction sensor 12 for detecting the direction of the sun a support frame 13 for unitarily supporting the lenses 11 and the sensor 12 a first motor 15 for rotating the support frame 13 together with the lenses 11 and the sensor 12 in a direction shown by an arrow a a rotatable shaft 17 installed perpendicularly to the rotatable shaft of the motor 15 for rotating the lenses 11 the sensor 12 and the support frame 13 and a second motor not shown in fig1 for rotating the rotatable shaft 17 in a direction shown by an arrow b the solar ray direction sensor 12 detects the direction of the sun and generates a detection signal the above.