A connector that electrically connects between a plate-like connection object (20, 23) and another connection object, including: a holder (5, 105, 205, 305, 405) that includes a frame portion (51, 351, 451) forming a plate-like connection object-accommodating portion for accommodating the plate-like connection object, and a connector main body that is mounted on the other connection object, and includes a holder accommodating portion for accommodating said holder, wherein said connector main body includes a housing and contacts that are held in said housing; wherein each of said contacts includes: a connection portion that is connected to the other connection object; and a contact portion that protrudes into said holder accommodating portion, and is brought into contact with the plate-like connection object accommodated in said plate-like connection object-accommodating portion when said holder is accommodated in said holder accommodating portion, wherein said frame portion is provided with deformation suppressing portions (S1-S7, S45-S50) for suppressing deformation of said contact portion, caused when said holder is inserted into or extracted out of said holder accommodating portion, characterized in that: said deformation suppressing portions are inclined portions that are inclined in a front-rear direction or a right-left direction of said frame portion as viewed in a holder inserting direction in which said frame portion is inserted into said holder accommodating portion said deformation suppressing portions (S1-S7) are provided on a front side and a rear side of said frame portion in a holder inserting direction in which said holder is inserted into said holder accommodating portion. a holder (5, 105, 205, 305, 405) that includes a frame portion (51, 351, 451) forming a plate-like connection object-accommodating portion for accommodating the plate-like connection object, and a connector main body that is mounted on the other connection object, and includes a holder accommodating portion for accommodating said holder, wherein said connector main body includes a housing and contacts that are held in said housing; wherein each of said contacts includes: a connection portion that is connected to the other connection object; and a contact portion that protrudes into said holder accommodating portion, and is brought into contact with the plate-like connection object accommodated in said plate-like connection object-accommodating portion when said holder is accommodated in said holder accommodating portion, wherein said frame portion is provided with deformation suppressing portions (S1-S7, S45-S50) for suppressing deformation of said contact portion, caused when said holder is inserted into or extracted out of said holder accommodating portion, a connection portion that is connected to the other connection object; and a contact portion that protrudes into said holder accommodating portion, and is brought into contact with the plate-like connection object accommodated in said plate-like connection object-accommodating portion when said holder is accommodated in said holder accommodating portion, wherein said frame portion is provided with deformation suppressing portions (S1-S7, S45-S50) for suppressing deformation of said contact portion, caused when said holder is inserted into or extracted out of said holder accommodating portion, said deformation suppressing portions are inclined portions that are inclined in a front-rear direction or a right-left direction of said frame portion as viewed in a holder inserting direction in which said frame portion is inserted into said holder accommodating portion said deformation suppressing portions (S1-S7) are provided on a front side and a rear side of said frame portion in a holder inserting direction in which said holder is inserted into said holder accommodating portion.