PROBLEM TO BE SOLVED: To provide: amorphous alloy powder which enables the fabrication of a powder-compact magnetic core achieving both a high magnetic permeability and a low iron loss with stability; a high-performance powder-compact magnetic core fabricated by use of the amorphous alloy powder; a high-performance magnetic device having the powder-compact magnetic core; and a highly reliable electronic device having the magnetic device.SOLUTION: A choke coil 10 comprises a powder-compact magnetic core 11, and a conducting wire 12. The powder-compact magnetic core 11 comprises amorphous alloy powder which includes Fe as a primary component, 10-14 atom% of Si, 8-13 atom% of B, 1-3 atom% of C, a atom% of Cr and b atom% of Mn, provided that a+b is 1.5 to 6, and b/a is between 1 and 2 inclusive.
