Telescopic device and massager

A massager, comprising a massage head and a telescopic device, said telescopic device comprises a drive motor (1), a telescopic mechanism (2) connected to said drive motor (1), and a housing (3), wherein said drive motor (1) and said telescopic mechanism (2) are disposed in said housing (3), said telescopic mechanism (2) comprises a reciprocating screw rod (21) and a sliding block (22), wherein said reciprocating screw rod (21) is connected to an output shaft of said drive motor (1), when said reciprocating screw rod (21) rotates, said sliding block (22) moves axially in a linear reciprocating manner along said reciprocating screw rod (21), a first guide member (23) is provided in said sliding block (22), said first guide member (23) extending into a threaded groove on a rod body of said reciprocating screw rod (21), and at least one set of guide assemblies (24) is arranged on a surface of said sliding block (22), wherein a sleeve tube (4) is provided on said sliding block (22), said sleeve tube (4) is fixedly connected to said sliding block (22), and an end of said sleeve tube (4) away from said sliding block (22) extends out of said housing (3), wherein said massage head is connected to said sleeve tube (4).