Seat belt buckle

A seat belt buckle comprising:

• a guide channel formed in a buckle frame, into which guide channel a tongue connected to the seat belt can be inserted;
• an ejector guided in a guide channel, upon which ejector an ejector spring is acting in the ejection direction opposite to the insertion direction;
• a locking element mounted on a buckle frame, which locking element can be moved out of an unlocking position into a locking position, in order to lock the tongue introduced into the guide channel;
• a securing element which can be moved into a securing position, for holding the locking element in the locking position, and into a release position for releasing the locking element;
• and,
• a blocking device provided on the securing element, which blocking device is moved into a blocking position, when the locking element is in the locking position, wherein the securing element is firmly held in the securing position by the blocking device against a movement into the release position, and the blocking device is thereby held in the blocking position by the ejector.