A patient transport device, comprising - an underframe with a lower frame provided with casters and/or rollers, an upper frame and with a lifting means, - wherein the lifting means is arranged between the lower frame and the upper frame and is provided for changing their mutual distance between a lowest lifting position and a highest lifting position, - wherein the lifting means comprises two scissor lift units (24, 26) in operative connection which are arranged on top of each other and of which the lower scissor lift unit is coupled with the lower frame and the upper scissor lift unit is coupled with the upper frame of the underframe, - wherein each scissor lift unit (24, 26) comprises two pairs of respectively a first bar and a second bar which cross each other and are pivotably connected to each other, and wherein both pairs are arranged laterally offset at a same level and are parallelly aligned to each other, - wherein a first end of each first bar of the lower scissor lift unit is rotatably connected with the lower frame and a first end of each second bar of the lower scissor lift unit is guided pivotably with the lower frame and displaceably at the lower frame, - wherein a first end of each first bar of the upper scissor lift unit is rotatably connected with the upper frame and a first end of each second bar of the upper scissor lift unit is guided pivotably with the upper frame and displaceably at the upper frame, - wherein each of the second ends (54, 56) of said bars (36, 38) of both scissor lift units (24, 26) which face away from the first ends (42, 46) of the above-mentioned bars (36, 38) are either directly coupled in a hinged manner or by at least the first bars and the second bars of a further, central scissor lift unit and are thus indirectly coupled in a hinged manner, and - a reclining surface having a head-side end and a foot-side end at and/or on the upper frame, wherein the reclining surface is connected with the upper frame or removably connectable with the upper frame, characterized in that - the lower frame of the underframe comprises two transverse frame sections (84, 85) and two transverse frame sections (88, 89) transverse thereto, wherein the first transverse frame section is facing the head-side end of the reclining surface and the second transverse frame section is facing the foot-side end of the reclining surface, - the two transverse frame sections (84, 85) of the lower frame each protrude beyond its second transverse frame section, wherein in said protruding sections of the transverse frame sections (84, 85) respectively one caster and/or roller is arranged, and - the lower thigh/foot part of the reclining surface is immersible at its foot-side end into the free space between the two protruding sections in the state folded down towards the lower frame of the underframe. - an underframe with a lower frame provided with casters and/or rollers, an upper frame and with a lifting means, - wherein the lifting means is arranged between the lower frame and the upper frame and is provided for changing their mutual distance between a lowest lifting position and a highest lifting position, - wherein the lifting means comprises two scissor lift units (24, 26) in operative connection which are arranged on top of each other and of which the lower scissor lift unit is coupled with the lower frame and the upper scissor lift unit is coupled with the upper frame of the underframe, - wherein each scissor lift unit (24, 26) comprises two pairs of respectively a first bar and a second bar which cross each other and are pivotably connected to each other, and wherein both pairs are arranged laterally offset at a same level and are parallelly aligned to each other, - wherein a first end of each first bar of the lower scissor lift unit is rotatably connected with the lower frame and a first end of each second bar of the lower scissor lift unit is guided pivotably with the lower frame and displaceably at the lower frame, - wherein a first end of each first bar of the upper scissor lift unit is rotatably connected with the upper frame and a first end of each second bar of the upper scissor lift unit is guided pivotably with the upper frame and displaceably at the upper frame, - wherein each of the second ends (54, 56) of said bars (36, 38) of both scissor lift units (24, 26) which face away from the first ends (42, 46) of the above-mentioned bars (36, 38) are either directly coupled in a hinged manner or by at least the first bars and the second bars of a further, central scissor lift unit and are thus indirectly coupled in a hinged manner, and - a reclining surface having a head-side end and a foot-side end at and/or on the upper frame, wherein the reclining surface is connected with the upper frame or removably connectable with the upper frame, - the lower frame of the underframe comprises two transverse frame sections (84, 85) and two transverse frame sections (88, 89) transverse thereto, wherein the first transverse frame section is facing the head-side end of the reclining surface and the second transverse frame section is facing the foot-side end of the reclining surface, - the two transverse frame sections (84, 85) of the lower frame each protrude beyond its second transverse frame section, wherein in said protruding sections of the transverse frame sections (84, 85) respectively one caster and/or roller is arranged, and - the lower thigh/foot part of the reclining surface is immersible at its foot-side end into the free space between the two protruding sections in the state folded down towards the lower frame of the underframe.