To provide an active material for a lithium cell and its manufacturing method as well as the lithium cell having a high cell voltage and a stable charge and discharge cycle property.

This active material is characterized in that it contains a chemical compound expressed by a general formula MP2O7 (M is at least one of metal atoms selected from Ti, Zr and Hf). The lithium cell 1 is characterized in that it includes a positive electrode 2, a negative electrode 3 and a Li-electrolyte ingredient including an electrolyte containing Li, and either the positive electrode 2 or the negative electrode 3 includes a chemical compound expressed by the general formula MP2O7 (M is at least one of metal atoms selected from Ti, Zr and Hf) capable of absorbing and releasing the Li as the active material and the other contains a matter containing the Li.