The present invention relates to a hat capable of exerting pyramid power for facilitating the blood circulation of brains by being worn on a head.
 Conventionally, the pyramid power is famous as one of unknown energy. The fact that carcasses of small animals had mostly remained without going rotten in a stone chamber located at one third the height above the ground in the pyramid provided a Frenchman with a clue to discover the pyramid power in about 1930. Thereafter, the pyramid power has been drawing attention and a Czechoslovakian electrical engineer, Carrel found that the pyramid power improved sharpness of a worn-out razor’s edge in 1954.
 In Japan, experiments for determining the degree of decomposition on oranges placed in and out of a pyramid were conducted by Professor Akio Sato of Konan University. As a result of the experiments, it was figured out that the orange placed out of the pyramid went rotten soon while the other orange placed in the pyramid was dried and mummified maintaining a shine for a year long.
 As to the above-mentioned pyramid power, the existence is recognized and taken by Kilrian photograph and a theory that the pyramid power is caused by energy of space microwave generating resonance action in a spatial structure of the pyramid has been proposed.
 However, the substance has not been worked out yet.
 On the other hand, forgetfulness, degradation in remembrance and in concentration of a human being mostly results from poor circulation of blood in the head. However, currently, hats for wearing on the head is provided with less contrivance to improve the circulation of the blood.