A combination (S, S') of an electronic component assembly and an adherend, the combination (S, S') comprising: an adherend including a first face on a first-direction side, a second face on a second-direction (Z') side, and a housing hole opening in the first face, the second direction (Z') being opposite to the first direction; and an electronic component assembly (D, D') comprising: a fixing part fixed to the first face of the adherend; an electronic component; and a housing including: a fixed portion fixed to the fixing part; and a housing body to house the electronic component, the housing body including a first portion disposed on the second-direction (Z') side relative to the fixing part, wherein the first portion of the housing body has a dimension in the second direction (Z') that is equal to, or smaller than, a dimension in the second direction (Z') of the housing hole of the adherend, and the first portion of the housing body is housed in the housing hole of the adherend without protruding in the second direction (Z') relative to the second face of the adherend, the housing body is of a generally tubular shape opening in the first direction and including a bottom on the second-direction (Z') side, the bottom of the housing body is in direct or indirect abutment with the electronic component, and the fixed portion extends from the housing body and is located on the first-direction side relative to the first portion of the housing body, characterized in that the electronic component assembly (D, D') further comprises a support, the support including: a support body fixed to the fixing part; and a leg extending from the support body in the second direction (Z'), being received inside the housing body of the housing, and being in direct or indirect abutment with the electronic component. an adherend including a first face on a first-direction side, a second face on a second-direction (Z') side, and a housing hole opening in the first face, the second direction (Z') being opposite to the first direction; and an electronic component assembly (D, D') comprising: a fixing part fixed to the first face of the adherend; an electronic component; and a housing including: a fixed portion fixed to the fixing part; and a housing body to house the electronic component, the housing body including a first portion disposed on the second-direction (Z') side relative to the fixing part, wherein a fixing part fixed to the first face of the adherend; an electronic component; and a housing including: a fixed portion fixed to the fixing part; and a housing body to house the electronic component, the housing body including a first portion disposed on the second-direction (Z') side relative to the fixing part, wherein a fixed portion fixed to the fixing part; and a housing body to house the electronic component, the housing body including a first portion disposed on the second-direction (Z') side relative to the fixing part, wherein the first portion of the housing body has a dimension in the second direction (Z') that is equal to, or smaller than, a dimension in the second direction (Z') of the housing hole of the adherend, and the first portion of the housing body is housed in the housing hole of the adherend without protruding in the second direction (Z') relative to the second face of the adherend, the housing body is of a generally tubular shape opening in the first direction and including a bottom on the second-direction (Z') side, the bottom of the housing body is in direct or indirect abutment with the electronic component, and the fixed portion extends from the housing body and is located on the first-direction side relative to the first portion of the housing body, characterized in that the electronic component assembly (D, D') further comprises a support, the support including: a support body fixed to the fixing part; and a leg extending from the support body in the second direction (Z'), being received inside the housing body of the housing, and being in direct or indirect abutment with the electronic component. a support body fixed to the fixing part; and a leg extending from the support body in the second direction (Z'), being received inside the housing body of the housing, and being in direct or indirect abutment with the electronic component.