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We have prepared shielding vessels, which has stainless steel substrates covered with YBaCuO coatings, by an atmospheric plasma spraying method. One of them have single-end open and the others double-ends open. Shielding effects inside superconducting YBaCuO vessels are measured at 77 K by a fluxgate magnetometer and a SQUID, changing applied AC fields of 10−5 T to 10−4 T and their frequencies of 0.1 Hz to 100 Hz. There is scarcely dependence on shielding effects of YBaCuO vessels for the strength and the frequency of magnetic fields examined. The field attenuation ratio is 10−6 in the center of a double-ends open vessel with a diameter of 60.5 mm and a length of 242.0 mm. For the single-end open vessel, with a diameter of 88.0 mm and a length of 176.0 mm, the field attenuation ratio is on the order of 10−5 in the portion near the bottom.