The present invention aims to provides a nonaqueous electrolyte battery having superior charging/discharging circulation performance, an active material for the nonaqueous electrolyte battery, a battery pack having the nonaqueous electrolyte battery, and a vehicle. According to one embodiment, an active material for a battery, a nonaqueous electrolyte battery (100) having the active material, a battery pack (200) including the nonaqueous electrolyte battery and a vehicle (50) are provided. The active material includes secondary particle which contains primary particles of a monoclinic [beta]-type titanium composite oxide having an average primary particle diameter of 1 nm to 10 [mu]m. The secondary particle has an average secondary particle diameter of 1 [mu]m to 100 [mu]m. The secondary particle has compression fracture strength of 20 MPa or more.