To provide insulating paper which suppresses electrostatic charge on a cooling liquid circulation passage and suppresses the increase of flow charge due to deterioration with the lapse of time in an oil-immersed transformer, and to provide a transformer using the same.

A stationary induction apparatus is formed of an iron core, a coil composed of wires which are attached to the iron core and on which the insulating paper is wound around, an insulator for coil insulation and an insulator constituting a cooling passage of an insulation cooling medium immersed in the insulation cooling medium having mineral oil in a transformer body. The insulating paper or insulator for the stationary induction apparatus includes pulp as a main material, and contains Ca ions of which the amount is reduced to 0.06 wt% or less. The stationary induction apparatus using the insulating paper or the insulator is also disclosed.