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Provided is a composite multilayer ceramic electronic component which is provided with a co-fired low-permittivity ceramic layer and high-permittivity ceramic layer and in which respectively befitting properties are obtained in the low-permittivity ceramic layer and high-permittivity ceramic layer. The low-permittivity ceramic layer (3) and the high-permittivity ceramic layer (4) are constituted of glass ceramics including : a first ceramic comprising MgAl2O4 and/or Mg2SiO4; a second ceramic comprising BaO, RE2O3 (RE being a rare earth element), and TiO2; glass each including 44.0-69.0 wt% of RO (where R is an alkaline earth metal), 14.2-30.0 wt% of SiO2, 10.0-20.0 wt% of B2O3, 0.5-4.0 wt% of Al2O3, 0.3-7.5 wt% of Li2O, and 0.1-5.5 wt% of MgO; and MnO; the content ratios of the glass and the like in the low-permittivity ceramic layer (3) and the high-dielectric constant ceramic layer (4) being different from each other.