Method for manufacturing powder magnetic core

A method for manufacturing a powder magnetic core, the method comprising:

• forming a soft magnetic powder layer by putting a soft magnetic powder having a surface on which an insulating coating film is formed into a space surrounded by a lower punch and a die;
• forming a pressed powder by compressing the soft magnetic powder layer in the die by the lower punch and an upper punch;
• and
• causing the pressed powder and the die to slide relative to each other and then removing the pressed powder from the die, wherein
• in forming the soft magnetic powder layer,
• a different powder different from the soft magnetic powder is put into the space before and after the soft magnetic powder is put into the space and a different powder layer having a spring back rate higher than that of the soft magnetic powder layer by 0.6-1.1% is formed on upper and lower sides of the soft magnetic powder layer.