A vehicle with an aerial work platform comprising: a vehicle body (10,20), a boom mounted on the vehicle body and being vertically swingable, a work platform attached to a tip of the boom and moved up and down by the boom, and a parallel link mechanism installed between the tip of the boom and the work platform, wherein the parallel link mechanism comprises: a boom side vertical link member pivotably connected to the tip of the boom on a first connecting pivot axis and extending vertically, an upper horizontal link member pivotably connected to the boom side vertical link member on the first connecting pivot axis and extends horizontally, a work platform side vertical link member pivotably connected to the upper horizontal link member on a second connecting pivot axis horizontally apart from the first connecting pivot axis and extends vertically, a lower horizontal link member pivotably connected to the work platform side vertical link member on a third connecting pivot axis, which locates below the second connecting pivot axis, and extends horizontally, and the lower horizontal link member being pivotally connected to the boom side vertical link member on a fourth connecting pivot axis, which locates below the first connecting pivot axis, wherein the work platform is attached to the work platform side vertical link member, characterized in that the parallel link mechanism allows the work platform to move up and down with respect to the boom side vertical link member, a load detecting device to detect a vertical load acting from the work platform to the boom is provided, wherein the load detecting device is vertically sandwiched between a boom side support formed on the boom side vertical link member and a work platform side support formed on the work platform side vertical link member to prevent vertical movement of the work platform, and a tip of a levelling cylinder attached to the boom is pivotably connected to the boom side vertical link member and the lower horizontal link member on the fourth connecting pivot axis. a boom side vertical link member pivotably connected to the tip of the boom on a first connecting pivot axis and extending vertically, an upper horizontal link member pivotably connected to the boom side vertical link member on the first connecting pivot axis and extends horizontally, a work platform side vertical link member pivotably connected to the upper horizontal link member on a second connecting pivot axis horizontally apart from the first connecting pivot axis and extends vertically, a lower horizontal link member pivotably connected to the work platform side vertical link member on a third connecting pivot axis, which locates below the second connecting pivot axis, and extends horizontally, and the lower horizontal link member being pivotally connected to the boom side vertical link member on a fourth connecting pivot axis, which locates below the first connecting pivot axis, wherein the work platform is attached to the work platform side vertical link member, characterized in that the parallel link mechanism allows the work platform to move up and down with respect to the boom side vertical link member, a load detecting device to detect a vertical load acting from the work platform to the boom is provided, wherein the load detecting device is vertically sandwiched between a boom side support formed on the boom side vertical link member and a work platform side support formed on the work platform side vertical link member to prevent vertical movement of the work platform, and a tip of a levelling cylinder attached to the boom is pivotably connected to the boom side vertical link member and the lower horizontal link member on the fourth connecting pivot axis.