NOVELTY - A pyroelectric device comprises an electrode layer A (2), a pyroelectric layer (4) having a perovskite crystal structure and an electrode layer B (6), are formed sequentially on a substrate (1). The electrode layer (A) contains noble metal and additive (3) selected from the group comprising titanium, cobalt, nickel, magnesium, iron, calcium, strontium, manganese, barium, aluminum and their oxides. The pyroelectric layer has a specific composition.    USE - Used for an infrared sensor (claimed) used for household appliances, for crime prevention and car electronics.    ADVANTAGE - The crystallinity and orientation of the pyroelectric layer are favorable. Variation in pyroelectric characteristics is reduced. Mass production is attained.    DETAILED DESCRIPTION - A pyroelectric device comprises an electrode layer (A), a pyroelectric layer having a perovskite crystal structure and a electrode layer (B) formed sequentially on a substrate. The electrode layer (A) contains noble metal and an additive selected from the group comprising titanium, cobalt, nickel, magnesium, iron, calcium, strontium, manganese, barium, aluminum and their oxides. The pyroelectric layer has a composition of formula: (Pb(1-y)Lay)Ti(1-y/4)O3 or (Pb(1-y)Lay)(ZrxTi(1-x)(1-y/4)O3, (where 0 less than y at most 0.2 and 0 less than x at most 0.2 or 0.55 at most x less than 0.8). The electrode layer (A) contains platinum, iridium, palladium or ruthenium, as noble metal. The amount of additive in the electrode layer (A) is 0-20 mol.%. The pyroelectric layer has a composition of formula: (1-z) (Pb(1-y)Lay)Ti(1-y/4)O3+ZAOn or (1-z)(Pb(1-y)Lay)(ZrxTi(1-x)(1-y/4)O3+ZAOn, (where 0 less than y at most 0.2, 0 less than x at most 0.2 or 0.55 at most x less than 0.8, 0 less than z at most 0.1 and A is magnesium or manganese). A is magnesium when n is 1 and A is manganese when n is 2.    INDEPENDENT CLAIMS are also included for the following:    (1) the manufacture of a pyroelectric device; and    (2) an infrared sensor.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of the pyroelectric device.    substrate (1)    electrode layer A (2)    additive (3)    pyroelectric layer (4)    pyroelectric material thin film (5)    electrode layer B (6)