A power storage apparatus comprising: a battery group connecting n series circuits in parallel (wherein n represents an integer of 2 or greater), each of the series circuits connecting a capacitor and a switching device; and a battery controller for controlling the switching devices based on allowable charge/discharge power of the capacitors, wherein the allowable charge/discharge power of the capacitor indicates an upper limit value of electric power chargeable/dischargeable to the capacitor, wherein the battery controller is configured to: detect an allowable charge/discharge power of each capacitor; and perform a switching control to determine a value k' so that the allowable charge/discharge power of the battery group becomes the maximum value (F max) of a value represented by the following (equation 1) and to set to ON the switching devices connected to the capacitors having the allowable charge/discharge power of W min (k') or greater among the n capacitors and to set to OFF the switching devices not connected to the capacitors having the allowable charge/discharge power of W min (k') or greater F = M × W min k [where in the above formula, k represents an integer of 1 or greater and n or smaller, k' is the k that provides the maximum value (F max), W min (k) is the allowable charge/discharge power smallest in the k-th place among the allowable charge/discharge power of the n capacitors, and M represents the number of the capacitors having the allowable charge/discharge power of the W min (k) or greater]. a battery group connecting n series circuits in parallel (wherein n represents an integer of 2 or greater), each of the series circuits connecting a capacitor and a switching device; and a battery controller for controlling the switching devices based on allowable charge/discharge power of the capacitors, wherein the allowable charge/discharge power of the capacitor indicates an upper limit value of electric power chargeable/dischargeable to the capacitor, wherein the battery controller is configured to: detect an allowable charge/discharge power of each capacitor; and perform a switching control to determine a value k' so that the allowable charge/discharge power of the battery group becomes the maximum value (F max) of a value represented by the following (equation 1) and to set to ON the switching devices connected to the capacitors having the allowable charge/discharge power of W min (k') or greater among the n capacitors and to set to OFF the switching devices not connected to the capacitors having the allowable charge/discharge power of W min (k') or greater F = M × W min k [where in the above formula, k represents an integer of 1 or greater and n or smaller, k' is the k that provides the maximum value (F max), W min (k) is the allowable charge/discharge power smallest in the k-th place among the allowable charge/discharge power of the n capacitors, and M represents the number of the capacitors having the allowable charge/discharge power of the W min (k) or greater]. detect an allowable charge/discharge power of each capacitor; and perform a switching control to determine a value k' so that the allowable charge/discharge power of the battery group becomes the maximum value (F max) of a value represented by the following (equation 1) and to set to ON the switching devices connected to the capacitors having the allowable charge/discharge power of W min (k') or greater among the n capacitors and to set to OFF the switching devices not connected to the capacitors having the allowable charge/discharge power of W min (k') or greater F = M × W min k [where in the above formula, k represents an integer of 1 or greater and n or smaller, k' is the k that provides the maximum value (F max), W min (k) is the allowable charge/discharge power smallest in the k-th place among the allowable charge/discharge power of the n capacitors, and M represents the number of the capacitors having the allowable charge/discharge power of the W min (k) or greater].