Method of manufacturing slim foam pad for vehicle seats and slim foam pad for vehicle seats manufactured using the same

A method of manufacturing a foam pad for vehicle seats, the method comprising:

• injecting a first foam solution into a first mold to manufacture an upper pad;
• inserting the manufactured upper pad into a second mold;
• and
• injecting a second foam solution to a surface of the upper pad inserted into the second mold to manufacture a lower pad integrally coupled to the upper pad,
• wherein the second foam solution is foamed in a state of being in direct contact with the surface of the upper pad, whereby no additional border separation member is provided at a border between the upper pad and the lower pad, and
• wherein, when the second foam solution is injected into the second mold, a third foam solution is injected into a bolster cavity defined in the second mold to simultaneously manufacture the lower pad integrally coupled to the upper pad and a bolster integrally coupled to the lower pad by foaming.