Forest machine, which includes - a chassis of at least two parts, comprising a first chassis and a second chassis pivoted consecutively by a central pivot, - sets of wheels arranged in connection with both the first chassis and the second chassis on both sides of the first chassis and the second chassis for supporting the forest machine on the ground, each of which sets of wheels includes at least two wheels at a distance from each other in the longitudinal direction of the chassis, of which at least one wheel in each set of wheels is a drive wheel, - an engine for creating drive power, fitted in connection with the first chassis, - power transmission for transmitting power from the engine to the sets of wheels of the second chassis, comprising a power transmission (24.1) of the first chassis located in the first chassis and a power transmission (24.2) of the second chassis located in the second chassis, in which the power transmission of the first chassis transmits power to the power transmission of the second chassis, which further transmits power to the sets of wheels of the second chassis, and - a load space for transporting a load, supported on the second chassis and extending at least mainly on top of the second chassis and at least partly on top of the sets of wheels of the second chassis in the operating position of the forest machine, which said load space extends at least partly below the upper surface of the sets of wheels between the sets of wheels, in order to lower the centre of gravity of the forest machine 10), in which the said second chassis includes two longitudinal parts attached to each other at least in front of the load space, which longitudinal parts are at a distance from each other in the lateral direction of the forest machine at least over part of the length of the load space, in which forest machine the load space extends between the longitudinal parts in the vertical direction of the forest machine, characterized in that the power transmission (24.2) of the said second chassis is arranged in the second chassis in front of the load space in the direction of travel of the forest machine, between the central pivot and the load space, in order to distribute power to the drive wheel of each set of wheels of the second chassis from in front of the load space, and each said drive wheel in the second chassis is installed in the second chassis a fixed position relative to the longitudinal length of the second chassis. - a chassis of at least two parts, comprising a first chassis and a second chassis pivoted consecutively by a central pivot, - sets of wheels arranged in connection with both the first chassis and the second chassis on both sides of the first chassis and the second chassis for supporting the forest machine on the ground, each of which sets of wheels includes at least two wheels at a distance from each other in the longitudinal direction of the chassis, of which at least one wheel in each set of wheels is a drive wheel, - an engine for creating drive power, fitted in connection with the first chassis, - power transmission for transmitting power from the engine to the sets of wheels of the second chassis, comprising a power transmission (24.1) of the first chassis located in the first chassis and a power transmission (24.2) of the second chassis located in the second chassis, in which the power transmission of the first chassis transmits power to the power transmission of the second chassis, which further transmits power to the sets of wheels of the second chassis, and - a load space for transporting a load, supported on the second chassis and extending at least mainly on top of the second chassis and at least partly on top of the sets of wheels of the second chassis in the operating position of the forest machine, which said load space extends at least partly below the upper surface of the sets of wheels between the sets of wheels, in order to lower the centre of gravity of the forest machine 10), in which the said second chassis includes two longitudinal parts attached to each other at least in front of the load space, which longitudinal parts are at a distance from each other in the lateral direction of the forest machine at least over part of the length of the load space, in which forest machine the load space extends between the longitudinal parts in the vertical direction of the forest machine, characterized in that the power transmission (24.2) of the said second chassis is arranged in the second chassis in front of the load space in the direction of travel of the forest machine, between the central pivot and the load space, in order to distribute power to the drive wheel of each set of wheels of the second chassis from in front of the load space, and each said drive wheel in the second chassis is installed in the second chassis a fixed position relative to the longitudinal length of the second chassis.