A terminal holder for holding a mobile terminal, the terminal holder comprising: a fixed portion having a fixed surface fixed to the mobile terminal or a terminal case covering the mobile terminal; and a holding portion having both ends connected to the fixed portion, the holding portion having a finger insertion space into which a finger is inserted to hold the mobile terminal or the terminal case; wherein the finger insertion space fails to overlap with the fixed portion as viewed from a direction orthogonal to the fixed surface, characterized in that: the holding portion is of flat plate shape and has a plane, the holding portion having one end portion connected to the fixed portion, the other end portion connected to the fixed portion, and a finger support portion connecting the one end portion and the other end portion to support the finger inserted into the finger insertion space, and wherein the holding portion and the fixed surface form a flat plane shape at the connection between the one end portion and the fixed portion, the holding portion being twisted in a 90 degree rotation of the holding portion in a first plane in a first direction and in addition also being twisted in a second plane perpendicular to the first plane in a 90 degree rotation from the one end portion to the other end portion through the finger support portion, the holding portion and the fixed surface forming a flat plane shape at the connection between the other end portion and the fixed portion, wherein the connection between the one end portion and the fixed portion and the connection between the other end portion and the fixed portion are on the same side of the fixed portion. a fixed portion having a fixed surface fixed to the mobile terminal or a terminal case covering the mobile terminal; and a holding portion having both ends connected to the fixed portion, the holding portion having a finger insertion space into which a finger is inserted to hold the mobile terminal or the terminal case; wherein the finger insertion space fails to overlap with the fixed portion as viewed from a direction orthogonal to the fixed surface, characterized in that: the holding portion is of flat plate shape and has a plane, the holding portion having one end portion connected to the fixed portion, the other end portion connected to the fixed portion, and a finger support portion connecting the one end portion and the other end portion to support the finger inserted into the finger insertion space, and wherein the holding portion and the fixed surface form a flat plane shape at the connection between the one end portion and the fixed portion, the holding portion being twisted in a 90 degree rotation of the holding portion in a first plane in a first direction and in addition also being twisted in a second plane perpendicular to the first plane in a 90 degree rotation from the one end portion to the other end portion through the finger support portion, the holding portion and the fixed surface forming a flat plane shape at the connection between the other end portion and the fixed portion, wherein the connection between the one end portion and the fixed portion and the connection between the other end portion and the fixed portion are on the same side of the fixed portion. the holding portion is of flat plate shape and has a plane, the holding portion having one end portion connected to the fixed portion, the other end portion connected to the fixed portion, and a finger support portion connecting the one end portion and the other end portion to support the finger inserted into the finger insertion space, and wherein the holding portion and the fixed surface form a flat plane shape at the connection between the one end portion and the fixed portion, the holding portion being twisted in a 90 degree rotation of the holding portion in a first plane in a first direction and in addition also being twisted in a second plane perpendicular to the first plane in a 90 degree rotation from the one end portion to the other end portion through the finger support portion, the holding portion and the fixed surface forming a flat plane shape at the connection between the other end portion and the fixed portion, wherein the connection between the one end portion and the fixed portion and the connection between the other end portion and the fixed portion are on the same side of the fixed portion.