A disposable diaper having a longitudinal direction and a transverse direction, the disposable diaper including: a chassis including a skin-facing surface, a non-skin-facing surface, a front waist region, a rear waist region, a crotch region lying between the front and rear waist regions and a liquid-absorbent structure extending in the longitudinal direction at least in the crotch region, characterised by elastic belt panels (16, 17) extending outwardly in the transverse direction from lateral edges of the chassis in the rear waist region, wherein: the chassis includes a main portion, lateral portions lying outboard of the main portion in the transverse direction provided with leg elastics (26, 27) and a pair of lateral elastic regions formed by folding the lateral portions inwardly; at least in the rear waist region of the front and rear waist regions is provided with a waist pocket panel formed separately of the elastic belt panels and adapted to connect lateral edges of the lateral elastic regions and the elastic belt panels are attached to outer lateral edges of the lateral elastic regions; the lateral elastic regions and outer end portions of the waist pocket panel are attached to the main portion through a first joint region extending in the transverse direction and the waist pocket panel is attached to the skin-facing surface of the inner side portions of the lateral joint regions through second joint regions extending in the longitudinal direction and the waist pocket panel is provided with a non-joint region defined outboard of the first joint region as viewed in the longitudinal direction and inboard of the second joint regions as viewed in the transverse direction; and the elastic belt panels are attached to the skin-facing surface of the outer lateral edges of the lateral elastic regions through third joint regions extending in the longitudinal direction and the lateral elastic regions include lateral non-joint regions lying between the second and third joint regions and lying inboard of the first joint region as viewed in the longitudinal direction. a chassis including a skin-facing surface, a non-skin-facing surface, a front waist region, a rear waist region, a crotch region lying between the front and rear waist regions and a liquid-absorbent structure extending in the longitudinal direction at least in the crotch region, characterised by elastic belt panels (16, 17) extending outwardly in the transverse direction from lateral edges of the chassis in the rear waist region, wherein: the chassis includes a main portion, lateral portions lying outboard of the main portion in the transverse direction provided with leg elastics (26, 27) and a pair of lateral elastic regions formed by folding the lateral portions inwardly; at least in the rear waist region of the front and rear waist regions is provided with a waist pocket panel formed separately of the elastic belt panels and adapted to connect lateral edges of the lateral elastic regions and the elastic belt panels are attached to outer lateral edges of the lateral elastic regions; the lateral elastic regions and outer end portions of the waist pocket panel are attached to the main portion through a first joint region extending in the transverse direction and the waist pocket panel is attached to the skin-facing surface of the inner side portions of the lateral joint regions through second joint regions extending in the longitudinal direction and the waist pocket panel is provided with a non-joint region defined outboard of the first joint region as viewed in the longitudinal direction and inboard of the second joint regions as viewed in the transverse direction; and the elastic belt panels are attached to the skin-facing surface of the outer lateral edges of the lateral elastic regions through third joint regions extending in the longitudinal direction and the lateral elastic regions include lateral non-joint regions lying between the second and third joint regions and lying inboard of the first joint region as viewed in the longitudinal direction. the chassis includes a main portion, lateral portions lying outboard of the main portion in the transverse direction provided with leg elastics (26, 27) and a pair of lateral elastic regions formed by folding the lateral portions inwardly; at least in the rear waist region of the front and rear waist regions is provided with a waist pocket panel formed separately of the elastic belt panels and adapted to connect lateral edges of the lateral elastic regions and the elastic belt panels are attached to outer lateral edges of the lateral elastic regions; the lateral elastic regions and outer end portions of the waist pocket panel are attached to the main portion through a first joint region extending in the transverse direction and the waist pocket panel is attached to the skin-facing surface of the inner side portions of the lateral joint regions through second joint regions extending in the longitudinal direction and the waist pocket panel is provided with a non-joint region defined outboard of the first joint region as viewed in the longitudinal direction and inboard of the second joint regions as viewed in the transverse direction; and the elastic belt panels are attached to the skin-facing surface of the outer lateral edges of the lateral elastic regions through third joint regions extending in the longitudinal direction and the lateral elastic regions include lateral non-joint regions lying between the second and third joint regions and lying inboard of the first joint region as viewed in the longitudinal direction.