An ironing board assembly, comprising: an ironing board, including: a main board having a substantially flat ironing surface that extends longitudinally between a first end and a second end; and at least one wing that is integrally and hingeably connected to said main board, such that it is rotatable around a rotation axis that extends substantially parallel to the ironing surface, between an extended position in which a wing surface of said wing extends the ironing surface of the main board, and a collapsed position in which the wing is located at a non-ironing side of the main board, characterized in that one of the main board and the wing is provided with a spring-loaded bolt including at least one locking stud, and wherein the other of the main board and the wing is provided with a keeper into which a locking stud-guide groove is provided, which guide groove ends in a locking stud-receiving recess, such that, when the wing is rotated between its collapsed position and its extended position, a spring driving the bolt forces the locking stud of the bolt into sliding engagement with the guide-groove of the keeper, and such that, once the wing reaches its extended position, the locking stud registers with the locking stud-receiving recess in the keeper, allowing the spring to force the locking stud into the locking stud-receiving recess so as to lock the mutual arrangement of the wing and the main board. an ironing board, including: a main board having a substantially flat ironing surface that extends longitudinally between a first end and a second end; and at least one wing that is integrally and hingeably connected to said main board, such that it is rotatable around a rotation axis that extends substantially parallel to the ironing surface, between an extended position in which a wing surface of said wing extends the ironing surface of the main board, and a collapsed position in which the wing is located at a non-ironing side of the main board, a main board having a substantially flat ironing surface that extends longitudinally between a first end and a second end; and at least one wing that is integrally and hingeably connected to said main board, such that it is rotatable around a rotation axis that extends substantially parallel to the ironing surface, between an extended position in which a wing surface of said wing extends the ironing surface of the main board, and a collapsed position in which the wing is located at a non-ironing side of the main board, characterized in that one of the main board and the wing is provided with a spring-loaded bolt including at least one locking stud, and wherein the other of the main board and the wing is provided with a keeper into which a locking stud-guide groove is provided, which guide groove ends in a locking stud-receiving recess, such that, when the wing is rotated between its collapsed position and its extended position, a spring driving the bolt forces the locking stud of the bolt into sliding engagement with the guide-groove of the keeper, and such that, once the wing reaches its extended position, the locking stud registers with the locking stud-receiving recess in the keeper, allowing the spring to force the locking stud into the locking stud-receiving recess so as to lock the mutual arrangement of the wing and the main board.