To provide a Si alloy material for health heaters and a small-size health heater being installable in a narrow room, reducing equipment expenses and operating cost, being easily carried and capable of highly efficiently heating a required site of a body.

This health heater 1 is formed by laying Si alloy materials 3, which are composed of 94.00-99.99 mass% of Si and the rest unavoidable impurities and have electric resistivity of 0.01 Ω-CM or less, between a fabric layer 2 formed by supporting ceramic powder and/or Si alloy material powder to a fabric, and a planar heating body 4; and emits minuscule amounts of radiation or far-infrared ray by heating the Si alloy materials 3.