NOVELTY - An electric double layer capacitor (3010) comprises a housing (3004) for housing a laminated capacitor cell (3005); and a mounting portion(s) (3007) for mounting the electric double layer capacitor on another device, where housing is made of functionally graded aluminum ceramic material, and the mounting portion and the housing being formed in one piece.    USE - The electric double layer capacitor is for an anti-lock brake system (wheel slide protection) for vehicles. It is used as the secondary battery. It is used for power supply installed in each vehicle. The anti-lock brake system is for trailers, which can perform the function of intermittently relaxing a breaking force applied to the wheels of a trailer that is being hauled by an engine.    ADVANTAGE - A high reliability and low power consumption anti-lock brake system is obtained. The anti-lock brake system provides safety. The electric double layer capacitor provides high resistance to surface exfoliation because its lead portion and mounting portion are made separately. It can be used in a wide temperature range because it employs aqueous (sulfuric) electrolyte instead of conventional organic electrolyte. It can prevent over-discharge of the power supply because the charge/discharge capacity is large, and has a long life.    DETAILED DESCRIPTION - An electric double layer capacitor comprises a laminated capacitor cell made by laminating capacitor unit cells having two activated carbon powder electrodes and sulfuric acid solution; a housing for housing the laminated capacitor cell; and a mounting portion(s) for mounting the electric double layer capacitor on another device, where housing is made of functionally graded aluminum ceramic material, and the mounting portion and the housing being formed in one piece.    DESCRIPTION OF DRAWING(S) - The figure is a sectional view of the electric double layer capacitor.    Housing (3004)    Laminated capacitor cell (3005)    Positive electrode (3006)    Mounting portion (3007)    Electric double layer capacitor (3010)