Prepreg and method for producing prepreg

A prepreg comprising:

• a fiber substrate;
• and
• a resin layer containing a thermosetting resin composition containing at least components [A] and [B] below, stacked on one surface of the fiber substrate,
• [A] thermosetting resin;
• and
• [B] curing agent of [A]
• wherein the fiber substrate is impregnated with a part of the thermosetting resin composition of the resin layer,
• when a surface on a resin layer side of the prepreg is a resin surface and a surface on an opposite side is a fiber substrate surface, there is a difference between a tackiness force of the resin surface and a tackiness force of the fiber substrate surface,
• the resin layer contained in the prepreg has a complex viscosity η3*24 at 24° C. of 20,000 to 100,000 Pa·s and a complex viscosity η3*70 at 70° C. of 100 to 5,000 Pa·s, and
• a volatile amount of the thermosetting resin composition is 1 mass % or less when a total mass of the prepreg is 100 mass %.