The present invention relates to a binder resin for a toner which is used in electrophotography and the like. An objective of the present invention is to obtain a binder resin for a toner containing a crystalline resin which satisfies both excellent low temperature fixing property and excellent offset resistance, a method for producing the binder resin, and a toner using the binder resin. The objective can be achieved by using a binder resin for a toner that is produced by subjecting an amorphous resin and a crystalline resin to melting, kneading and reaction, and is characterized in that it includes a network structure which includes a crystalline resin.