A neurotrophic factor production promoting device is provided, which is able to promote production of a neurotrophic factor or neurotrophic factor-like substance in an affected area by a simple technique that, regardless of the place of treatment, can be performed without transplantation of cells or injection into the affected area, in order to prevent or treat various diseases such as brain diseases. In order to apply a high frequency alternating magnetic field in the range of 20 MHz to 180 MHz, 280 MHz to 600 MHz, or 700 MHz to 1000 MHz to cells at a magnetic flux density of no more than 0.01 Tesla, the neurotrophic factor production promoting device includes a high frequency electromagnetic wave generating means generating a high frequency electromagnetic wave of the abovementioned frequency, in which the magnetic stimulation by the high frequency alternating electromagnetic field of the abovementioned high frequency allows the intracellular concentration of calcium ions to be increased so that exocytosis of the neurotrophic factor group is induced, and the magnetic stimulation allows messenger ribonucleic acid (mRNA) of the neurotrophic factor group to be increased in the cells so that the synthesis and extracellular release of the neurotrophic factor group are promoted.
