Method for manufacturing core, and method for manufacturing turbine member in which core is acquired by said core manufacturing method

A method for manufacturing a core comprising:

• a coating step of adding a binder to a large particle group composed of large particles, and only coating surfaces of the large particles with the binder;
• a mixing step of mixing, after the coating step, the large particle group and a small particle group composed of small particles having a smaller particle size than the large particles and not coated with the binder;
• and
• a laminate shaping step of forming, after the mixing step, a molding in which a mixture of the large and small particle groups is used,
• wherein particle sizes of the large particles are equal to or more than 10 μm and equal to or less than 50 μm, and particle sizes of the small particles are equal to or more than 0.1 μm and equal to or less than 10 μm.