A seat arrangement, in particular for aircraft, comprising at least two rows (12a, 12b) each comprising a first and a second seat (14a, 14b, 16a, 16b) oriented in the same direction and each comprising a seat portion and a backrest coupled to the seat portion and movable relative to the seat portion between an inclined position wherein the backrest is inclined relative to the seat portion and an extended position wherein the backrest is substantially in the same plane as the seat portion, the rows (12a, 12b) extending along an axis (Al) configured to be parallel to a longitudinal axis (Y-Y') of the aircraft, the two seats of the same row being aligned and disposed side by side on the same transverse axis perpendicular to the axis (Al) parallel to the longitudinal axis (Y-Y'), - the first seat (14a, 14b) extending along a first axis directed in a first direction, in particular towards the outside, and inclined at a first angle (αl) relative to the axis (Al) parallel to the longitudinal axis (Y-Y'), and - the second seat (16a, 16b) extending along a second axis directed in a second direction, in particular towards the inside, opposite the first direction relative to the axis (Al) parallel to the longitudinal axis and inclined at a second angle (β1) with the axis (Al) parallel to the longitudinal axis (Y-Y'), each row comprising a shell (22a, 22b) delimiting a first housing for receiving said first seat (14a, 14b) and a second housing for receiving the second seat (16a, 16b) adjacent to said first housing and located on the same axis as the first housing, the second housing being separated axially from said first housing by a separation wall extending along an axis inclined relative to the axis (Al) parallel to the longitudinal axis (Y-Y'), the shell (22a, 22b) comprising an upstream part (34a, 34b) connected to the upstream of the central separation wall and a rear part (36a, 36b) connected to the rear of the central separation wall, each upstream part (34a, 34b) being disposed upstream of the second seat of the corresponding row while leaving a first passage with said seat to access said second seat and the upstream part of a shell of a rear row delimiting with the shell of an upstream row a second passage to access the first seat of the rear row. - the first seat (14a, 14b) extending along a first axis directed in a first direction, in particular towards the outside, and inclined at a first angle (αl) relative to the axis (Al) parallel to the longitudinal axis (Y-Y'), and - the second seat (16a, 16b) extending along a second axis directed in a second direction, in particular towards the inside, opposite the first direction relative to the axis (Al) parallel to the longitudinal axis and inclined at a second angle (β1) with the axis (Al) parallel to the longitudinal axis (Y-Y'), each row comprising a shell (22a, 22b) delimiting a first housing for receiving said first seat (14a, 14b) and a second housing for receiving the second seat (16a, 16b) adjacent to said first housing and located on the same axis as the first housing, the second housing being separated axially from said first housing by a separation wall extending along an axis inclined relative to the axis (Al) parallel to the longitudinal axis (Y-Y'), the shell (22a, 22b) comprising an upstream part (34a, 34b) connected to the upstream of the central separation wall and a rear part (36a, 36b) connected to the rear of the central separation wall, each upstream part (34a, 34b) being disposed upstream of the second seat of the corresponding row while leaving a first passage with said seat to access said second seat and the upstream part of a shell of a rear row delimiting with the shell of an upstream row a second passage to access the first seat of the rear row.