A position adjusting mechanism which adjusts the inclination of a seating part of the car seats comprises: - an outer frame; - connecting bracket-Is connected to said outer frame; an inner frame interlocking with said outer frame; - a connecting member which fastens said outer frame to the inner frame from both side by means of a first hole; - an inner plate, a casing plate wherein the inner plate and the casing plate are located at the outer frame in an opposite direction and in a mirrored way; - a gear located between said inner plate and the casing plate by pins and washers; - a main arm including a connection channel and a locking channel; - two actuating mechanisms having a sandwich type structure which are engaged to said gear by means of a locking bulge and which consist of a step lock fitted to the locking channel by a lock pin; - a connecting shaft interconnecting said actuating mechanisms; - a triggering arm which provides detachment of said step lock from the gear and extends into the outer frame by means of a third hole; and - an inclination mechanism consisting of two springs with one end thereof connected to each connecting channel of said main arm and the other end thereof connected to each connecting bracket; characterized in comprising: - a locking arc formed on a back part of said step lock facing the triggering arm, - a locking arm which enters the locking arc and exits the locking arc, - a step gear onto which a connecting channel is located, wherein the step gear is fastened to said inner frame and is engaged to the gear by means of a grooved structure thereof, - a connecting member which moves in the connecting channel of said step gear and extends into the connecting channel from the outer frame by means of a second hole. - an outer frame; - connecting bracket-Is connected to said outer frame; an inner frame interlocking with said outer frame; - a connecting member which fastens said outer frame to the inner frame from both side by means of a first hole; - an inner plate, a casing plate wherein the inner plate and the casing plate are located at the outer frame in an opposite direction and in a mirrored way; - a gear located between said inner plate and the casing plate by pins and washers; - a main arm including a connection channel and a locking channel; - two actuating mechanisms having a sandwich type structure which are engaged to said gear by means of a locking bulge and which consist of a step lock fitted to the locking channel by a lock pin; - a connecting shaft interconnecting said actuating mechanisms; - a triggering arm which provides detachment of said step lock from the gear and extends into the outer frame by means of a third hole; and - an inclination mechanism consisting of two springs with one end thereof connected to each connecting channel of said main arm and the other end thereof connected to each connecting bracket; - a locking arc formed on a back part of said step lock facing the triggering arm, - a locking arm which enters the locking arc and exits the locking arc, - a step gear onto which a connecting channel is located, wherein the step gear is fastened to said inner frame and is engaged to the gear by means of a grooved structure thereof, - a connecting member which moves in the connecting channel of said step gear and extends into the connecting channel from the outer frame by means of a second hole.