A pants-type wearing article having a longitudinal direction and a transverse direction being orthogonal to the longitudinal direction, comprising: a skin-facing surface; a non-skin-facing surface; a front waist region; a rear waist region; a crotch region extending between the front and rear waist regions (11, 12) and having concave lateral edges; a chassis defining the front and rear waist regions (11, 12) and the crotch region; and a liquid-absorbent structure affixed to the skin-facing surface of the chassis and extending in the longitudinal direction at least in the crotch region, wherein: the chassis includes a base sheet extending through the front and rear waist regions (11, 12) and the crotch region, a front waist sheet layered with the base sheet in the front waist region and defining together with the base sheet the front waist region and a portion of the crotch region, and a rear waist sheet layered with the base sheet in the rear waist region and defining together with the base sheet the rear waist region and a portion of the crotch region, wherein the front waist sheet and the rear waist sheet are spaced apart from each other in the longitudinal direction in the crotch region; wherein the chassis has a multilayer zone in the crotch region composed of the base sheet and the front waist sheet and rear waist sheet layered with each other, a monolayer zone formed of the base sheet alone and lying between a first boundary defined by an intermediate inner end of the front waist sheet and a second boundary defined by an intermediate inner end of the rear waist sheet, wherein the first boundary and the second boundary extend in the transverse direction; and in the portion of the crotch region close to the front waist region, the multilayer zone includes corners each surrounded by the first boundary, an inner end in the longitudinal direction of the front waist region, a joint region extending in the longitudinal direction in which the liquid-absorbent structure is bonded to the chassis and the concave lateral edge of the crotch region, wherein the first boundary extends across the joint region. a skin-facing surface; a non-skin-facing surface; a front waist region; a rear waist region; a crotch region extending between the front and rear waist regions (11, 12) and having concave lateral edges; a chassis defining the front and rear waist regions (11, 12) and the crotch region; and a liquid-absorbent structure affixed to the skin-facing surface of the chassis and extending in the longitudinal direction at least in the crotch region, wherein: the chassis includes a base sheet extending through the front and rear waist regions (11, 12) and the crotch region, a front waist sheet layered with the base sheet in the front waist region and defining together with the base sheet the front waist region and a portion of the crotch region, and a rear waist sheet layered with the base sheet in the rear waist region and defining together with the base sheet the rear waist region and a portion of the crotch region, wherein the front waist sheet and the rear waist sheet are spaced apart from each other in the longitudinal direction in the crotch region; wherein the chassis has a multilayer zone in the crotch region composed of the base sheet and the front waist sheet and rear waist sheet layered with each other, a monolayer zone formed of the base sheet alone and lying between a first boundary defined by an intermediate inner end of the front waist sheet and a second boundary defined by an intermediate inner end of the rear waist sheet, wherein the first boundary and the second boundary extend in the transverse direction; and in the portion of the crotch region close to the front waist region, the multilayer zone includes corners each surrounded by the first boundary, an inner end in the longitudinal direction of the front waist region, a joint region extending in the longitudinal direction in which the liquid-absorbent structure is bonded to the chassis and the concave lateral edge of the crotch region, wherein the first boundary extends across the joint region. the chassis includes a base sheet extending through the front and rear waist regions (11, 12) and the crotch region, a front waist sheet layered with the base sheet in the front waist region and defining together with the base sheet the front waist region and a portion of the crotch region, and a rear waist sheet layered with the base sheet in the rear waist region and defining together with the base sheet the rear waist region and a portion of the crotch region, wherein the front waist sheet and the rear waist sheet are spaced apart from each other in the longitudinal direction in the crotch region; wherein the chassis has a multilayer zone in the crotch region composed of the base sheet and the front waist sheet and rear waist sheet layered with each other, a monolayer zone formed of the base sheet alone and lying between a first boundary defined by an intermediate inner end of the front waist sheet and a second boundary defined by an intermediate inner end of the rear waist sheet, wherein the first boundary and the second boundary extend in the transverse direction; and in the portion of the crotch region close to the front waist region, the multilayer zone includes corners each surrounded by the first boundary, an inner end in the longitudinal direction of the front waist region, a joint region extending in the longitudinal direction in which the liquid-absorbent structure is bonded to the chassis and the concave lateral edge of the crotch region, wherein the first boundary extends across the joint region.