A vehicle comprising: a hydraulic pump; a hydraulic actuator which is driven by pressurized oil supplied from the hydraulic pump; wherein at least one of the hydraulic pump and the hydraulic actuator is a fluid working machine (11, 12) which comprises: an eccentric cam; a plurality of pistons arranged radially around the eccentric cam; a plurality of cylinders provided for the plurality of pistons, respectively, each of the pistons being configured to reciprocate along a radial direction of the eccentric cam by rotation of the eccentric cam; a plurality of drive rods which are provided for the plurality of pistons, respectively, and wherein at least one of said drive rods comprises: a main part that extends along a corresponding one of the cylinders; an engaging part that is formed at one end of the main part and is engaged with corresponding one of the pistons; and a contact part that is formed at the other end of the main part and contacts the eccentric cam; a at least one holding member that is arranged about the main part and extends along the axial direction of the drive rod; at least one pressing member which presses the respective holding members, outward in the radial direction of the eccentric cam, characterised by at least one holding ring which is arranged on the radially outwards side of a plurality of holding members to hold the plurality of holding members from the radially outwards of the holding members. a hydraulic pump; a hydraulic actuator which is driven by pressurized oil supplied from the hydraulic pump; wherein at least one of the hydraulic pump and the hydraulic actuator is a fluid working machine (11, 12) which comprises: an eccentric cam; a plurality of pistons arranged radially around the eccentric cam; a plurality of cylinders provided for the plurality of pistons, respectively, each of the pistons being configured to reciprocate along a radial direction of the eccentric cam by rotation of the eccentric cam; a plurality of drive rods which are provided for the plurality of pistons, respectively, and wherein at least one of said drive rods comprises: a main part that extends along a corresponding one of the cylinders; an engaging part that is formed at one end of the main part and is engaged with corresponding one of the pistons; and a contact part that is formed at the other end of the main part and contacts the eccentric cam; a at least one holding member that is arranged about the main part and extends along the axial direction of the drive rod; at least one pressing member which presses the respective holding members, outward in the radial direction of the eccentric cam, characterised by at least one holding ring which is arranged on the radially outwards side of a plurality of holding members to hold the plurality of holding members from the radially outwards of the holding members. an eccentric cam; a plurality of pistons arranged radially around the eccentric cam; a plurality of cylinders provided for the plurality of pistons, respectively, each of the pistons being configured to reciprocate along a radial direction of the eccentric cam by rotation of the eccentric cam; a plurality of drive rods which are provided for the plurality of pistons, respectively, and wherein at least one of said drive rods comprises: a main part that extends along a corresponding one of the cylinders; an engaging part that is formed at one end of the main part and is engaged with corresponding one of the pistons; and a contact part that is formed at the other end of the main part and contacts the eccentric cam; a at least one holding member that is arranged about the main part and extends along the axial direction of the drive rod; at least one pressing member which presses the respective holding members, outward in the radial direction of the eccentric cam, characterised by a main part that extends along a corresponding one of the cylinders; an engaging part that is formed at one end of the main part and is engaged with corresponding one of the pistons; and a contact part that is formed at the other end of the main part and contacts the eccentric cam; a at least one holding member that is arranged about the main part and extends along the axial direction of the drive rod; at least one pressing member which presses the respective holding members, outward in the radial direction of the eccentric cam, characterised by at least one holding ring which is arranged on the radially outwards side of a plurality of holding members to hold the plurality of holding members from the radially outwards of the holding members.